Brake master cylinder

[Stevekid1]

I am changing the master cylinder and when I separated it from the servo the picture shows what came out. Can anyone tell me what the star washer is for and where it goes please?

Thanks in advance,

Steve

[sujitroy]

when I separated my master cylinder from the servo. that rod didn't come out of the servo. maybe it was used to hold the rod in the servo and has broken

[jbuckl]

Afaiaa the star washer holds it in.

Make sure it’s all as it should be though.

Have seen servo repair write - ups online.

Have managed to successfully rebuild a servo, although the seal kit seems pricey compared to a ready rebuilt one with new zinc plating.

Stag master cylinders don’t seem to respond well to fitting new seals .

Usually require a new bore fitting (stainless steel repair) or a complete replacement cylinder .

[FrenchStag]

Yes, that black rod should be fixed inside the servo, and then it just slots inside the master cylinder loosely and pushes it when pedal is pushed. You’ll need to find a diagram of the servo to see how it is supposed to be fixed in place (and how easy to fit it back). Good luck.

[Gaeda]

Here is a picture:
image.png

[flying farmer]

Those star washers dislodge very easily if you are trying to change the master cylinder without removing the servo. They usually poke back into place pretty easily.

[gbb483]

One side effect of changing the brake master cylinder - the stop lamp switch may be ineffective. I changed mine back in the winter and I've only just noticed that my brake lights wouldn't go off. I had to double-side sticky a 2mm spacer to the brake pedal arm where it meets the stop lamp switch.

[jbuckl]

One side effect of changing the brake master cylinder - the stop lamp switch may be ineffective. I changed mine back in the winter and I've only just noticed that my brake lights wouldn't go off. I had to double-side sticky a 2mm spacer to the brake pedal arm where it meets the stop lamp switch.

The switch bracket can to tweaked to adjust the switch position… better than a spacer that will probably fall of at some point

[wilf]

Agree with Julian - I had to reposition the brake light switch on my car after changing the brake master cylinder - only needs a slight change in the brake pedal position to require this. Easy job.