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hi Ive got a vc wagon that I'm trying to get roadworthy, and the only thing standing in my way is the brakes, i have upgraded to vl 15/16th booster and master cylinder vl front calipers and vk disc brake rear end i have bled the brakes so the pedal is rock hard, then i turn on the car and the pedal goes to the floor just about and is spongy as,
it has been to the mechanic and he said he thought it was the master cylinder, so i changed that and still the same problem, then i went and spoke to a brake specialist place who said to clamp the lines to find if it was the master cylinder which it was not, so now I'm kind of stumped has anyone got any suggestions? could it be calipers? have i missed something vital?
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Have you bled the master cylinder?
What you need to do is undo the front pipe (the vertical one, not the 45 degree angle one).
You let fluid drip out of there for a minute or so & then put the pipe back on.
This gets rid of any air in the front chamber of the master cylinder, as generally no amount of bleeding the 4 calipers will shift it.
These things are important while you do it:
1. DO NOT touch the brake pedal or any of the bleed screws or calipers.
2. Leave the lid on the master (stops the fluid pouring out too fast), but make sure its full first.
Cheers,
Mick
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Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
Cheers,
Mick
_______________________________________________________________
Judge a successful man not on how he treats his peers, but on how he treats those less fortunate. |
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Check that the reaction pad is still in place inside the brake booster, behind the master cylinder. I had the exact same symptoms you describe with a UC Torana once (same master cylinder as the VC). I went through 4 x different master cylinders before I found the problem. Reaction pad can fall off the pushrod and into the booster.
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If we all had the same (good) taste, who would buy all the Fords? |
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If we all had the same (good) taste, who would buy all the Fords? |
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Rank: Member
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Another thing to check is for stuck/cocked pads. This can cause "springing" at the pedal as the pads flex under pressure and wont be so obvious until the engine is running.
Also, what brake hoses did you use? The earlier VC hoses have a criss-cross pattern on them and are known to "balloon" under pressure. The VL hoses have thin lines running down their length and solves this problem.
Finally, the front hoses come out of the inner guard, rise upwards, then drop back down to the caliper. Pull the hoses down in a straight line to the caliper while bleeding as air can get trapped in the upwards loop.
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