1967 Pontiac GTO peddle to the floor

GOAT 67

MEMBER
1967 PONTIAC GTO

Brakes problem
1967 Pontiac GTO V8 Two Wheel Drive Automatic

my peddle goes to the floor il pump them they go back to normal. Il wait or drive then they will go to the floor again. There is no visiable fluid leaking.

Saturday, March 21st, 2009 AT 8:48 AM

3 Replies

MMPRINCE4000

MECHANIC
8,548 POSTS

You can try bleeding the entire brake system, front and rear (do not let the MC fluid level run out).

If problem persists, and there are no hydraulic fluid leaks, then replace the Master Cylinder and bench bleed it before installing on car.

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Saturday, March 21st, 2009 AT 8:57 AM

GOAT 67

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2 POSTS

Thanks, but how do you bench bleed the master cylinder.

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Sunday, March 22nd, 2009 AT 9:32 AM

MMPRINCE4000

MECHANIC
8,548 POSTS

Put MC in a vise (not too tight). Either plug the outlet ports or buy a bleeder set that connects to ports and directs fluid flow back to resivoiur (spelling).

Fill MC with new brake fluid, use large screwdrive and push on piston (NO MORE THAN 3/4 of an inch stroke) until all air is out of MC and only clear fluid pumps out.

If you plug the outlet ports push piston (3/4" stroke) until all air bubbles disappear.

This prelubes the MC seal and prevents the seal from coming in contact with dry bore causing seal failure.

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Monday, March 23rd, 2009 AT 6:49 AM