Outer Limits 4x4 Board

Before you tell me to buy a nissan, jeep etc, just wondering if anyone that has previously owned a hilux and done a brake conversion or any mechanics out there can help. and yes i have posted in the toyota section too but i'm desperate for help.

ok

i've put the bigger motor in my 84 extra cab yn 65, the engineer said i have to upgrade to vented disc brakes.
so i have done that used dba 151 discs, all bolted on fine, bought some calipers off OL, 1996 model hilux ones, the pads are faily new, everything bolted up first go, but for the last month I HAVE NOT HAD BRAKES.

Every time i apply the brakes the pedal goes to the floor as if there is a heap of air in the system, there is not. I repeat, there is no air in the lines, they have now been bled about 20 times by myself and 2 reputable mechanics workshops. I have put a kit through the calipers and still get this problem.
If i jump on the brakes hard, the rear wheels lock up and the fronts do fark all, then second pump, I HAVE FULL BRAKES. Go figure.

Has anyone done this brake conversion and is the standard hilux master cylinder up to the task?

I have had all sorts of advice so far and now i'm looking at replacing the shims behind the pads baecause they are slightly bent...

It is frustrating the shyte out of me, as the brakes were working fine before i changed the calipers.
Less than a month before a trip to Cape York i need to get the problem sorted.

Any advice hould be appreciated.
Cheers Chris

Swap in the master cyl as well sounds like your not getting enough fluid moved in one hit ..
I know that the later model calipers had larger pistons in em, not exactly sure what year it came in though. ( the details are in the toyota section somewhere though).

seals may be gone in the master cyclinder

i agree with love_mud you have to get the brake booster that goes with the calipers

If this fais buy a nissan

Get the booster and master cylinder which originally matched the calipers you now have in the front. Be prepared to muck with the rear brakes once this is done - you may find they lock up too easily.

Scott

thanks all for your advice but the problem turned out to be much, MUCH! simpler.

The steel shims that sit in between the pads and the pistons had a slight bow to them, this was the only thing that the brake guy that i buy all my stuff from could find wrong with the brakes. i took them out and the problem went away. I will put new ones in today.

If your in Sydney and need brake stuff here's a wrap for Peter.

Weldon Brake & Clutch
Shop 4, Cnr Kareena Rd & The Boulevarde,
Miranda 2228
ph 9524 0903

Cheers Chris