https://rennlist.com/forums/showthre...ferrerid=28499

https://rennlist.com/forums/showthre...ferrerid=28499

^prior threads on these brakes and install

Been having difficulty keeping a firm brake pedal not a problem on the street but having to push the pedal deeper and occ having to pump the brakes. Seems okay for one track day after bleeding but by second day I wasn't happy. So ordered brake rebuild kit, bunch of seals to be replaced, smaller dust seal and wider main oil seal. Pistons are stainless so supposed to hold up well and new pistons not incuded in kit.

 

little bit of compressed air and cardboard to keep pistons from flying out!
oh yeah after opening the bleeder, don't forget to push the brake pedal down and rig something to keep it down part way before taking the the line off to stop brake fluid from drain out..

 

a little dirty I guess

 

cleaning up/polishing pistons, I used 1000 grit sand paper

 

removing with pick, cleaning up and installing new seals

 

This one clean up fine too

 

Wiggled everything back in after coating with brake fluid.

 

I have the other side to do yet. I'll report back how it works out when I get some miles and perhaps a track day on it.

 

Well, everything is back together and now pedal seems solid, no leaks. Will have to wait a bit til next track day to really test out..

 

Thank you!

How did you rig the brake pedal half way down? Would a brake line cap also work?

https://www.mechanicsurplus.com/prod...xoCsLcQAvD_BwE

 

 

sure a cap might work, you'd have to find the right size, would need a female... (on these calipers I have banjo fittings so would need a bolt with washers I suppose might work)
but trust me, holding the brake pedal down is way way easier and less messy

 

Nice job and write up. I did the rebuild on my stock calipers as well a few years ago as I wanted to powder coat them. Those square seals are no fun... when trying to put the pistons back in. Job done but wasn't fun. End result looked great. Congrats!

 

Great closeup picts and nice work as always! What do you attribute the "gunk" on the pistons from? You are pretty meticulous about clean brake fluid, and the brakes are not that old - what do you think, is it stuff getting past the seals into the callpers or from the fluid itself (or even from heat cycling the fluid causing buildup?).

Cheers,

Mike

 

Mike, you know I over maintain all my cars. Brakes are bled before every track day. I use Castrol srf, might have used motul 600 a few times. Not quite sure what the gunk is. I assume it’s from heat/fluid. On the positive note, this was pretty easy to do, and they sent me enough seals to do another rebuild... they definitely needed the rebuild, they are now back to normal/very solid feel.