What do I need to replace the brushes in Bosch Bulldog 11210VSR

It sounds like the issue with your Bosch bulldog extreme max hammer is likely due to worn out or damaged brushes. Here are the steps to remove and replace the brushes:

1. Unplug the hammer drill from the power source.
2. Remove the two screws on the top of the hammer drill handle with a screwdriver.
3. Lift off the top of the handle to expose the motor.
4. Locate the brush holders on either side of the motor.
5. Gently pull out the brush holder on one side of the motor.
6. Remove the brush from the holder by gently pulling it straight out.
7. Repeat for the other side of the motor.
8. Inspect the brushes for damage, wear, or discoloration. Blackening of the brushes is normal, but if they are excessively worn or damaged, they should be replaced.
9. Insert the new brushes into the brush holders, making sure they are properly seated.
10. Replace the brush holder on one side of the motor, then the other.
11. Reattach the top of the handle and replace the screws.

Regarding the digs in the motor surface, if they are not too deep and do not appear to affect the operation of the motor, they may not need to be addressed. However, if they are deep or if they appear to be affecting the motor's performance, it may be necessary to replace the motor.
It's important to note that working on power tools can be dangerous and should only be attempted by those with the necessary knowledge and experience. If you're unsure about any step in the process, it's best to seek the help of a professional.

Lots of parts inside it.

Repair videos

https://www.google.com/search?q=bosch+bulldog+11255VSR+stopped+hammering

https://www.ereplacementparts.com/bosch-11255vsr-0611255539-sdsplus-bulldog-xtreme-rotary-hammer-parts-c-128_1376_7448.html

Better image

https://www.aliexpress.com/item/1005002042848411.html?pdp_npi=2%40dis%21CAD%21C%24%203.81%21C%24%203.81%21%21%21%21%21%402101d1b116703544106556022e5b19%2112000018525198068%21btf&_t=pvid:5850845c-953c-45e6-aaa6-39cb556488d5&afTraceInfo=1005002042848411__pc__pcBridgePPC__xxxxxx__1670354410&spm=a2g0o.ppclist.product.mainProduct

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Faulty switch or worn / badly seated carbon brushes are the most likely reason.

https://www.google.com/search?q=Bosch+Bulldog+Cordless+hammer+drill+stops+working+when+pressure+is+applied+to+drill+bit

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• If look at brushholder unmount it and make clean look if the brushes are go good to each other most causes on this BOSCH tools is that the brushes 70% are hanging on dirth in the brush holder (brushplate) 16 first problem second true problem are the 2 suppression coils (adapter module 817 ) on the electric field. and also parts pos 19 left right switch contacts for the brushes can sometimes on ofthem be broken.

http://www.powertools-aftersalesservice.com/public/bosch-pt/service?p_auth=3aqey22L&p_p_auth=svtCUe1o&p_p_id=WSRP_bc93764e__6873__4b00__9a29__b331c9759da9&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&_WSRP_bc93764e__6873__4b00__9a29__b331c9759da9_wsrp-navigationalState=L0JPUy9QVEFTLVBULVNJUy1TaXRlL2VuX1VTLy0vVVNEL1ZpZXdQcm9kdWN0LURpc3BhdGNoO3BnaWQ9YmNkZTdkNTFiZjM0NGE0YTU1ZjYzYTYyOGY0MkRvVWFTdFRIO3NpZD1QYnVpWlFuNGVZcGtyVjZMemRLLW5nWnpLM0FSaDhEanA3b2h6b3RZdmhBZ3hZcFR2eHM9

model numbers are 3 different 0 611 255 539
0 611 255 739
3 611 B55 539

But brushes 1 617 000 525 are for all models the same bosch number.
Online to buy ( 1 suggestion )

BOSCH CARBON BRUSHES GBS AND GSB PART 1 617 000 525 GBH 2 22E GBH 2 26DFR...

if its like the ones I worked on you need to pull the brushes up into the tube and you will nitice a small tab on the bottom of the brush holder, push that in and it should lock the brush up and out of the way, the ring then would have to be turned into a somewhat neutral position to unlock the holding tabs on it. Let me know if you need more assistance. I went to ereplacementparts.com and looked at a parts diagram for this tool.

Unscrew the caps, carefully remove the old brush, replace it with a new one that is exactly like the old. Replace the screw cap. Thats it.

http://www.ereplacementparts.com/bosch-parts-c-128.html

the oil seal is broken, remove front cover at the chuck end of the drill, and replace the seal,

Yes, check the brushes on the motor, see if they can be replaced - I don't know your drill, but some can be checked without pulling the case apart - look for a round slotted cover on the sides near the rear of the drill