Hello. My Bosch GSR 14,4-2-LI screwdriver for several years recently began to spark like on the attached video. At low speed it is ok but when the engine stops at high speed, sparks fly and smell. I suspect brushes, so now the question is how to disassemble and replace them on this engine? It is...

Hello, brushes in this model are unchangeable. It only remains to buy a new one. greetings

Yes, but not so much spark. Besides, there should not be a smell of burning.

And you can not see the brushes through all the holes in the motor housing? The motor can be undressed only not easy because it is pressed. You have to work a little to do it. Tighten the motor in a vise and use a small screwdriver to straighten these creases. I was opening a similar engine once.

With the opening and assumption there will be no problem, I wonder more about whether I will get the right brushes on the market and whether they can be replaced. Because if it's not the only thing that's left to me, I'll get the engine to the end.

If you can dismantle a pressed engine, it should not give you a problem to find similar brushes, or to make them. Someone put them there ...

High probability that the engine will fit from makita 6281 only the rack will need to be pierced. Enter the external dimension of the impeller, but without the enclosing metal, as it also goes through and the length without the mandrel.

Hello. It looks like the engine is fine. You have a screwdriver that has an auto-stop function, ie when you turn it off with the button, the engine stops immediately. For a fraction of a second after releasing the switch, the voltage is applied in opposite phase to stop the motor immediately. At this point, the sparking on the brushes increases, the higher the higher the engine speed. The motor and brushes are okay, the normal operation of this motor in this screwdriver.

Hello. I have such a screwdriver, at the beginning there was no sparking, then it appeared, and recently when the holes in plastic pots were drilled, the engine got smoky. The engine was replaced at the authorized service center and after replacing the replaced spark. This bothers me, because in my opinion such sparking shortens the life of the engine. I do not need the auto brake function, can anyone know how to turn it off?

That's right. But if a screwdriver walked forever then you would not have to buy another one, right? In those times everything is produced in such a way that it would break down as quickly as possible. The Auto - stop function is intended to immediately stop the drill or screw, which prevents it from breaking, etc. For me, the option is not useful. If it works, you have nothing to worry about. The engine is already very tired and will probably die soon. Look for another engine or a second screwdriver. These engines are disposable like the motors in toys that look similar. Similar engines also sit in dryers, blenders, etc.

Bosch GSR 14,4-2-LI - Sparking - worn brushes - how to replace?

errol 31113 14

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#1 16970451 18 Jan 2018 11:55

errol errol

Level 9

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Post #1
16970451 18 Jan 2018 11:55

Hello.
My Bosch GSR 14,4-2-LI screwdriver for several years recently began to spark like on the attached video. At low speed it is ok but when the engine stops at high speed, sparks fly and smell. I suspect brushes, so now the question is how to disassemble and replace them on this engine? It is pressed on the back. New, original costs PLN 200 (e.g. here ) so its replacement is unprofitable - it is better to buy a new screwdriver.
Or maybe they are not brushes? I am asking for help in solving the problem.

[Film: 00778562e2] https://filmy.elektroda.pl/42_1516272673.mp4 [/ film: 00778562e2]
[Film: 00778562e2] https://filmy.elektroda.pl/87_1516272733.mp4 [/ film: 00778562e2]
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#2 16970644 18 Jan 2018 13:27

Kamilpl123 Kamilpl123

Level 15

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Post #2
16970644 18 Jan 2018 13:27

Hello, brushes in this model are unchangeable. It only remains to buy a new one.

greetings
#3 16971116 18 Jan 2018 17:00

TomekB123 TomekB123

Level 20

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Post #3
16971116 18 Jan 2018 17:00

Sparking when the engine stops is normal.
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#4 16971398 18 Jan 2018 19:00

errol errol

Level 9

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Post #4
16971398 18 Jan 2018 19:00

Yes, but not so much spark. Besides, there should not be a smell of burning.
#5 16971843 18 Jan 2018 21:35

wiertacz wiertacz

Level 35

» | Helpful post? (+3)

Post #5
16971843 18 Jan 2018 21:35

And you can not see the brushes through all the holes in the motor housing?
The motor can be undressed only not easy because it is pressed.
You have to work a little to do it.
Tighten the motor in a vise and use a small screwdriver to straighten these creases.
I was opening a similar engine once.
#6 16972120 19 Jan 2018 00:05

errol errol

Level 9

» | Topic author Helpful post? (0)

Post #6
16972120 19 Jan 2018 00:05

With the opening and assumption there will be no problem, I wonder more about whether I will get the right brushes on the market and whether they can be replaced. Because if it's not the only thing that's left to me, I'll get the engine to the end.
#7 16972290 19 Jan 2018 08:06

stanislaw1954 stanislaw1954

Level 43

» | Helpful post? (+3)

Post #7
16972290 19 Jan 2018 08:06

errol wrote:
I am more concerned about whether I will get the right brush on the market

errol wrote:
With the opening and assumption there will be no problem
If you can dismantle a pressed engine, it should not give you a problem to find similar brushes, or to make them.
errol wrote:
if they can be replaced.
Someone put them there ...
#8 17062289 25 Feb 2018 12:52

Jacek1983rr Jacek1983rr

Level 24

» | Helpful post? (+1)

Post #8
17062289 25 Feb 2018 12:52

High probability that the engine will fit from makita 6281 only the rack will need to be pierced. Enter the external dimension of the impeller, but without the enclosing metal, as it also goes through and the length without the mandrel.
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#9 17159621 10 Apr 2018 11:06

ziomekorko ziomekorko

Level 19

» | Helpful post? (+2)

Post #9
17159621 10 Apr 2018 11:06

Hello. It looks like the engine is fine. You have a screwdriver that has an auto-stop function, ie when you turn it off with the button, the engine stops immediately. For a fraction of a second after releasing the switch, the voltage is applied in opposite phase to stop the motor immediately. At this point, the sparking on the brushes increases, the higher the higher the engine speed. The motor and brushes are okay, the normal operation of this motor in this screwdriver.
#10 17174264 18 Apr 2018 09:40

linuxa linuxa

Level 2

» | Helpful post? (0)

Post #10
17174264 18 Apr 2018 09:40

Hello. I have such a screwdriver, at the beginning there was no sparking, then it appeared, and recently when the holes in plastic pots were drilled, the engine got smoky. The engine was replaced at the authorized service center and after replacing the replaced spark. This bothers me, because in my opinion such sparking shortens the life of the engine. I do not need the auto brake function, can anyone know how to turn it off?
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#11 17174351 18 Apr 2018 10:29

LENIWIEC_PL LENIWIEC_PL

Level 28

» | Helpful post? (+1)

Post #11
17174351 18 Apr 2018 10:29

linuxa wrote:
This bothers me, because in my opinion such sparking shortens the life of the engine.

That's right. But if a screwdriver walked forever then you would not have to buy another one, right? In those times everything is produced in such a way that it would break down as quickly as possible. The Auto - stop function is intended to immediately stop the drill or screw, which prevents it from breaking, etc. For me, the option is not useful.

errol wrote:
With the opening and assumption there will be no problem, I wonder more about whether I will get the right brushes on the market and whether they can be replaced. Because if it's not the only thing that's left to me, I'll get the engine to the end.

If it works, you have nothing to worry about. The engine is already very tired and will probably die soon. Look for another engine or a second screwdriver. These engines are disposable like the motors in toys that look similar. Similar engines also sit in dryers, blenders, etc.
#12 17493685 13 Oct 2018 11:05

Bałdyzer Bałdyzer

Level 12

» | Helpful post? (0)

Post #12
17493685 13 Oct 2018 11:05

I do not want to create a new topic, I will ask if the carbon brushes can be ground off the side, because they fit too tightly into the brush holder? It's about grinding 0.1-0.2mm on the side.
#13 17493852 13 Oct 2018 12:56

jerry1960 jerry1960

Level 37

» | Helpful post? (+2)

Post #13
17493852 13 Oct 2018 12:56

You can sand down. the brush should slide loosely in the brush holder.
#14 17494328 13 Oct 2018 17:31

Bałdyzer Bałdyzer

Level 12

» | Helpful post? (+1)

Post #14
17494328 13 Oct 2018 17:31

jerry1960 wrote:
You can sand down. the brush should slide loosely in the brush holder.

thanks for the quick answer
#15 18154755 06 Sep 2019 17:59

lewkowicz17 lewkowicz17

Level 12

» | Positive voted Helpful post? (+6)

Post #15
18154755 06 Sep 2019 17:59

Hello.
I have a problem with this screwdriver. It filled me with screwing on a tightly tightened screw that she didn't unscrew and didn't turn on anymore. I haven't undressed her yet.
What could go wrong?
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Topic summary

✨ The Bosch GSR 14,4-2-LI screwdriver has been reported to spark excessively, particularly when stopping at high speeds, leading the user to suspect worn brushes. Responses indicate that the brushes in this model are not replaceable, suggesting that purchasing a new screwdriver may be more economical. Some users noted that sparking can be normal due to the auto-stop function, which increases brush sparking upon motor shutdown. Others discussed the possibility of disassembling the motor to inspect or replace brushes, although this may be challenging due to the motor being pressed together. There are also mentions of compatibility with Makita motors and the potential for modifying brushes to fit better in their holders.
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Bosch GSR 14,4-2-LI - Sparking - worn brushes - how to replace?

FAQ

TL;DR: On the Bosch GSR 14,4-2-LI, a new motor can cost about PLN 200, and “I suspect brushes” is a common first guess—but this model’s brushes aren’t user-replaceable. [Elektroda, errol, post #16970451] Why it matters: This FAQ helps DIYers decide if sparking is normal braking, a failing motor, or a repair path worth the cost.

Quick Facts

Brushes in this model are described as unchangeable; motor replacement is the standard fix. [Elektroda, Kamilpl123, post #16970644]
The tool uses electronic auto‑stop; braking increases visible sparking at higher RPM. [Elektroda, ziomekorko, post #17159621]
Typical replacement motor price cited: around PLN 200, making repair a cost/benefit call. [Elektroda, errol, post #16970451]
The motor can is pressed; opening requires straightening the case crimps. [Elektroda, wiertacz, post #16971843]
Brushes should slide freely; light sanding to fit is acceptable. [Elektroda, jerry1960, post #17493852]

Why does my GSR 14,4-2-LI spark when I release the trigger?

That’s the electronic brake. When you release the switch, reverse‑phase voltage briefly stops the motor, which increases visible sparking at higher speed. This is normal behavior for this screwdriver. [Elektroda, ziomekorko, post #17159621]

Is heavy sparking with a burning smell normal?

No. Brief sparks at stop are normal, but a burning smell or smoke indicates stress or failure. One user reported smoke and a service motor swap, with braking sparks still present afterward. Stop use and inspect the motor. [Elektroda, linuxa, post #17174264]

Are the brushes replaceable on the Bosch GSR 14,4-2-LI?

A contributor familiar with this model states the brushes are unchangeable. The practical path is replacing the motor assembly rather than just brushes. “Brushes in this model are unchangeable.” [Elektroda, Kamilpl123, post #16970644]

How do I open the pressed motor can to inspect internals?

How‑To: 1) Clamp the motor carefully in a vise. 2) With a small screwdriver, straighten the perimeter crimps. 3) Lift the endbell to access the commutator and brushes. It’s doable, but not easy due to the pressed case. [Elektroda, wiertacz, post #16971843]

Can I source or make compatible brushes if I do open it?

If you can dismantle a pressed motor, you can find similar brushes or fabricate them to size. As one user put it, someone installed them there originally, so replacements can be fitted with effort. [Elektroda, stanislaw1954, post #16972290]

Will a Makita 6281 motor fit the GSR 14,4-2-LI?

A user reports high likelihood of fit with the Makita 6281 motor, noting the rack may need rework. They recommend measuring the impeller’s outer dimension and length without the mandrel. Fitment requires verification. [Elektroda, Jacek1983rr, post #17062289]

How can I disable the auto‑stop (electronic brake)?

The thread explains how the brake works but doesn’t provide a user method to disable it. The brake is part of the control electronics and designed for safety and precision stopping. Disabling isn’t covered or advised. [Elektroda, ziomekorko, post #17159621]

Can I sand carbon brushes to fit a tight brush holder?

Yes. Brushes must slide freely in the holder. Lightly sand until they move without sticking. Ensure edges are smooth and dust is removed before reassembly. “The brush should slide loosely in the brush holder.” [Elektroda, jerry1960, post #17493852]

How much material can I remove if a brush is slightly oversized?

One user asked about removing 0.1–0.2 mm per side to reduce tightness. This illustrates the small tolerances involved; remove minimal material and test frequently for smooth travel. Keep dust out of the motor. [Elektroda, Bałdyzer, post #17493685]

My driver stalled on a tight screw and won’t start. What likely failed?

Severe stall can overheat or damage the motor. In a related case, smoke led to service replacement of the motor, after which braking sparks remained normal. Inspect the motor and electronics before reuse. [Elektroda, linuxa, post #17174264]

Is sparking at stop harmful long‑term?

Brief braking sparks are expected, but sustained heavy arcing increases wear. A user confirms concern that sparking shortens motor life; keep vents clean and avoid prolonged high‑RPM stops under load. [Elektroda, LENIWIEC_PL, post #17174351]

When is a new motor more sensible than repair?

If the motor costs around PLN 200 and brushes aren’t serviceable, full motor replacement or a new driver may be more economical. Compare cost, time, and tool age before deciding. [Elektroda, errol, post #16970451]

What’s a quick way to tell normal vs fault sparking?

Normal: brief spark right as you release the trigger, no smell. Fault: continuous arcing, burning smell, or smoke during run or stop. If in doubt, stop and inspect. [Elektroda, errol, post #16971398]

Is sparking at stop actually normal on this model?

Yes. A user states, “Sparking when the engine stops is normal.” Expect more visible sparks at higher RPM due to the brake. This doesn’t by itself indicate failure. [Elektroda, TomekB123, post #16971116]

Any risks in opening the pressed motor can myself?

Yes. The can is crimped and difficult to reclose perfectly. Poor reassembly can misalign brushes or reduce magnet gap, causing noise or rapid wear. Proceed only with proper tools and care. [Elektroda, wiertacz, post #16971843]

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