Technical Tips > Pre 84

Brake Pedal going to the floor

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76Vett:
Hello again. Thanks for all your tips. I gave up on this problem for a while and have been fixing other things. I decide to give this another go yesterday with some assistance from my son. I tried all the tips and tricks that you all mentioned and did get some more air out of the lines after bleeding another 3 times. The pedal feels very firm now with the engine off but again once the car is started the pedal has a lot of travel, probably 100mm (too much for my liking). This morning I double checked the length of the Booster push rod in relation to the depth of the recess in the Master cylinder piston and both seem to match at 1 1/8". What am I missing?  :thud:

toyvet:
HELLO 76 VETT FOR THE ANSWER TO YOUR BRAKE PROBLEM CALL ( ALLAN DEAN ) CLUB MEMBER ON 0430769293 HE'LL BE HAPPY TO HELP YOU WITH YOUR PROBLEM.
REGARDS

JORGE

bfit:
Question

Have you access to the equipment to make a brake line adaptor to fit a gauge inline to measure exactly
What pressure brake system is developing.
Check both circuits your looking for 1000 to 1200 PSI

Have you checked to see what happens  at the master cyl. When the brake peddle released
Take the lid off and watch as the brakes are applied and released ,
Is the oil is flowing back to the resiviour  with some force , then there is a problem down stream.

If the flex hoses are new quality hoses then there is still air in the system.
Bfit

 

72vet:
And another question, :bolt:
do you still have the old master cylinder, if so, compare the recess depth of the old master cylinder piston to the new one. Are they the same?

76Vett:
Thanks to all for your tips and guidance. I will try your suggestions and see how where I end up.

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