Thursday, Dec 19, 2019 at 19:08
Sooo
long story short of it is..
I have a hj47
Standard 84 with nil factory upgrades like power steering or 5speed but i have the factory AC.
I have always had terrible brakes.
I went to slotted rotors.. and that helped the front a little.
Rears are drums..
We pretty much run exactly same drivetrain except you have wider diffs.
I run a heavy setup around 3t gross with the canopy ... fridge
I adjusted the lpsv myself.
But brakes were still average.
Soo after a few years i found a really good brake
shop who does custom stuff.
He made up a pressure guage and tested the brake pressure.
Vacuum was lazy..
Soo we replaced the alternator.
As the V Pump is on this in the diesels.
Ok.. soo we got vacuum.
The rear pressures needed to come up .
Soo lpsv was adjusted again.
A further 25mm via a new bracket.
Now pressures come good.
But when im on a steep
hill.
I really have to put 2 feet on the brake pedal to stop me from rolling back.
Soo its really struggling to hold hills with light brake pressure.
We used a toyota surf booster and it bolted straight up.
But the pushrod needed cutting down or something.
We then were able to source a new hz80 master cylinder for even more pressure.
It works brilliantly
I can be 3tonne gross AND tow a 1tonne trailer and hold it on a
hill with very little brake pressure.
One foot and possibly 2 -3 kg of force will hold the ute on any
hill.
Where as before at 3t gross
I would need both feet on the brake pedal and id have that much pressure on the pedal my back would be pushed into the
seat !!!.
It wasnt a very expensive exercise in the end.
Funny though..
I was getting this brake work done and while he was testing the old setup..
The pushrod snapped on the brake booster and he had to use the good handbrake i had in the ute.
Of which he never even got on the road.
This happened between the rear yard of the
shop on the driveway.
Soo i really did perfectly time this upgrade.
I would suggest raise your lpsv 30mm at a minimum
And maybe another 15 - 20mm on top of that if you feel no difference.
A crued method is to find a dirt road and try locking the brakes up at a low speed like 20 - 40km/h.
I did find a small improvement as i felt the back end did help the front a bit..
But i didnt go any further adjustment but i should have done and 25mm.
Im running 33x 12.5 x 15 bfg muds
Drum rear
Factory disc... but now slotted
Noo braided brake lines.
The booster and master cylinder upgrade is the best thing ive done
I now feel confident in pulling the ute up in any gross weight i am.
Cruisers from 40 - to the current hdj to the newer vdj series have woeful brakes as they were made from factory.
AnswerID:
629150