Sticking Brake Piston

[byroncobra]

Thanks Geof,

I'm sure it's only the rear as there's no problem spinning the front wheels. I don't expect a pressure build up there. I'll try it tho.

I remember a Harrison exclusive fix on the MC to get the back brakes more effective, I can't remember what I did though!

I'll pull it off....cant think what else it could be.

I have been looking for excuses for slow lap times......

[07cob]

Originally Posted by byroncobra

I remember a Harrison exclusive fix on the MC to get the back brakes more effective, I can't remember what I did though!

Did you make a change to the MC from the original? There was talk of removing an o-ring from the proportioning valve to equalise the pressure and provide more grip at the rear.

Geof

[byroncobra]

yeah i did that geof, but early in the build but this problem is recent.

Gaz got me thinking, re the actuating rod on the booster. Mine doesn't have an external adjustment just a bolt that screws through the pedal bracket to adjust the freeplay and brakelight switch. Perhaps it's moved in, shortening the pedal throw and thus actuating the brake. Anyway, I've adjusted it ready to test......
however I now need to bleed the brakes after cracking them earlier and i won't have a helper till tomorrow so watch this space......

Jim, no recent pad change, it was during the trackwork at the Nationals that I first noticed the heat and i just put it down to heavy braking, but it's all the time now.
It's a Ford XD single piston MC, no obvious freeplay that you mention. If the test tomorrow fails I'll try your suggestion to crack the front brake line

Thanks Fellas