MACE VH

Hey guys i need some help here guys im at my witts end seriously f***ing me off. I bought a brake upgrade kit for my 1984 holden vh 202 we all no what the standard brakes are like on these shit.

I have two front rotors 290mm with vt twin pot calipers and also 1 inch bore pbr master cylinder brand new. Now the brakes all bolted up fine and fit well but they wont keep a firm pedal. I have bleed the front discs and rear drums three times each time that they are bleed i pump the brake and it feels fine but when i fire it up the frigen thing goes soft again???? any help guys would be awesome!!!

76lxhatch

Sounds like you still haven't bled all the air out. Bleeding brakes can be a prick of a job at the best of times, let alone when the calipers are dry/new. You'll probably go through a lot of fluid, and the only way to get it done properly is with two people and good technique. It can be quite frustrating but keep at it.

MACE VH

Thanks lx hatch how many times would you have to bleed the brakes to keep a firm brake pedal? The vt calipers have been rekitted with all new seals to and new brake hoses.

Smitty2

unfortunately..there are those out there who flog VT front upgrades
and forget that the VT setup is completely different to early birds.

VT brake systems use a fast fill valving system in the master cylinder
to allow the twin piston caliper to work properly.

Even using a large or HDT style 1"master cylinder means you get a soggy pedal
all the time as the pedal has to move further (despite the large master cyl)
to fill the twin piston caliper. you get long pedal travel..or a soggy pedal

solution..buy a VT master/booster modded for early birds
lots sell ém to fix up those who got burnt....

have a look - Performance Brake Packages

hth

Smitty

76lxhatch

You can still get better than a sink to the floor pedal with a standard 1" master though surely? How does the fast fill valve work?

Bleeding those twin piston calipers always takes me forever, although I don't do it all that often, a pro would probably get it done quicker. The one on my HZ ute used VT calipers and that came up fine, currently working on the AU calipers for the Torana (Hoppers kit). The reason I mentioned bleeding is because it always gives me grief and I read what was written above as the extra push from the vacuum booster was sinking the pedal. It only has to be bled once to keep the pedal firm but it has to be done properly.

Edit: the Commodore master is different to the HZ and Torana though too, so maybe there's something in that?

MACE VH

So what do you guys think i should do is there an easy solution new booster?? as it still runs a standard booster with the pbr 1' master.