so ive just fitted brand new brake discs and pads to my car then bleed the system twice and the brake pedal just goes straight to the floor, anyone know why? help would be appreciated
thanks
rhys.

 

How are you bleeding the brakes..with a 1man bleed kit or...? Also what car is it. Front or rear brakes?

And I presume you've tried pumping the pedal?

Matt

 

im using the 1 man bleeding kit yeah and its a fiesta xr2i just the front brakes

rhys.

 

sometimes when pushing the piston back in the calipers it can reverse the seal in the master cylinder was it ok before you fitted the new brakes

 

was fine before i fitted the new ones yeah, what could i do to fix it?

rhys.

 

Anyone?

 

Exactly as said above, it sounds like you have 'Flipped' the master cylinder seals. This is why I bleed at the same time as I rewind the piston, so the pressure is not being reversed, this is what Haynes etc recommend as well.

If it is this, you have no option but to dismantle the master cylinder and relocate the seals, so far as I know.

Martin

 

If the brakes were fine before, why were you bothering to bleed them?

 

either renew the master cylinder or dismantle. when pushing pistons back i always open the bleed nipple i learnt the hard way as i flipped a seal in an amg merc and had to fit a new master cylinder at a cost of Ł380 pounds

 

okay cheers guys will try that now

 

Think i may have done the same when fitting new discs and pads.

Pedal is rock solid as normal if you press it hard, but if you press very lightly it'll eventually end up on the floor.

Was absolutely fine during track session at ford fair too, but had gotten slightly worse in the couple weeks after it started. Where's best for a rebuild kit?

 

AstoN_B, I work for a car smallish accessories company & no company do any repair kits for Master Cylinder anymore unless there maybe anything on ebay but I doubt it

 

i know BigRed do caliper rebuilds/kits for most fords old n new. Might see if they can do master cylinder kits too.

 

Ahh do they? Mite be worth bearing in mind then