Brake problems, absolutely no feel and cant stop the car

Brake problems, absolutely no feel and cant stop the car

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DBaldwin

Original Poster:

126 posts

176 months

Sunday 24th June 2018
quotequote all
Hi guys, looking for some help regarding my brakes as im at a bit of a loss.

I’ve got a heavily modified clio 172 race car which has:
a tilton pedalbox with independent front and rear master cylinders,
new copper pipes with a tilton rear bias adjuster,
Standard rear brakes (new)
Standard front calliper with carbon Lorraine rc6 pads, ktec discs and Castrol react fluid

It’s all newly built and i feel ive ticked all the boxes to make up a great set up and i had most of the work professionally done yet im having issues of having absolutely no feel through the brakes and they get progressively worse to the point of dangerous through the period of a 15 minute race as i just cant stop the car. No amount of brake bleeding seems to solve the issue and also gives no indication of any masses of air in the system.

The front pads did however look heavily worn which i thought was premature after just 2 or 3 days on track? The rear brakes look fine. It’s a similar set up to my competitors apart from the pedalbox set up.

This leads me on to whats causing the awful pedal feel and it to be spongey and generally crap? I’m going to replace the front calliper as a matter of eliminating them as their virtually the only thing that isn’t new but i have a feeling the problem must be hydraulic. Any ideas appreciated as a bit lost as to what it could be.

DBaldwin

Original Poster:

126 posts

176 months

Sunday 24th June 2018
quotequote all
frodo_monkey said:
What size front and rear master cylinders?
Stupidly forgot to write down what they were yesterday when i took the engine out, will note them down tomorrow. Supplier recommends 0.625” front and 0.700” rear so hoping thats whats fitted.