No Brake Pedal
Thread Starter
Pro
Joined: Nov 2003
Posts: 692
Likes: 1
From: Peabody Ma.
No Brake Pedal
I took every thing out and reinstalled new lines , new master cyl , new oring calipers , old porpution vave. The brakes seem to work but I cant get a good pedal, I tried a hand vacuum, neumatic bleeder, manual bleeding. I also bench bled master ( not sure if about it ) any way of telling where the problem is ?
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
"porpution vave"? New one...
You need to very carefully inspect every single fitting and make absolutely sure there are no leaks. With any leak you'll never get a good pedal. Once you are sure there are no leaks bleed again. With your system that is all new it can take a long time to get the air out. Make sure you bleed BOTH bleeders on the rear caliper.
It may seem stupid, but make sure you have the calipers in the right spot. Bleeders should point UP. And before you ask, yes I once swapped left and right calipers on a car and couldn't figure out why the pedal was soft.
Vacuum bleeders work ok, but I have had the best luck with pressure bleeders.
If that also fails some people have good luck with gravity bleeding. Open all bleeders for an hour or two (keeping the MC topped off).
You need to very carefully inspect every single fitting and make absolutely sure there are no leaks. With any leak you'll never get a good pedal. Once you are sure there are no leaks bleed again. With your system that is all new it can take a long time to get the air out. Make sure you bleed BOTH bleeders on the rear caliper.
It may seem stupid, but make sure you have the calipers in the right spot. Bleeders should point UP. And before you ask, yes I once swapped left and right calipers on a car and couldn't figure out why the pedal was soft.
Vacuum bleeders work ok, but I have had the best luck with pressure bleeders.
If that also fails some people have good luck with gravity bleeding. Open all bleeders for an hour or two (keeping the MC topped off).
Safety Car
Joined: Jul 2001
Posts: 3,921
Likes: 2
From: York PA
Originally Posted by zwede
Vacuum bleeders work ok, but I have had the best luck with pressure bleeders.
If that also fails some people have good luck with gravity bleeding. Open all bleeders for an hour or two (keeping the MC topped off).
If that also fails some people have good luck with gravity bleeding. Open all bleeders for an hour or two (keeping the MC topped off).
Also are you bleeding the brakes in the correct order? I think you are supposed to do them FL, FR, RL, RR. If you do them in the wrong order the proportioning valve causes problems and you will never get good pedal. Hopefully someone will chime in with the correct order.
Safety Car
Joined: Jun 2001
Posts: 4,004
Likes: 2
From: Severna Park Md
The sequence for bleeding is left rear, right rear, left front, right front. Are you getting a good pedal that doesnt maintain after driving? If so it could be rotor runout. If runout is outside of specs then the original style caliper lip seals will allow air to be sucked into the caliper bores. Pedal goes soft quickly when that happens. Many of us have converted to o-ring caliper seals to help this problem.
