adjusting brake bias on 1999 tdi

[mud_slut]

Originally Posted by amlav

Hand brake should be readjusted only after all new brake pads are readjusted and set.
It is fairly simple : adjust brake pads cogs until you reach to just a slight friction of pads and break drums with no brake pedal pressed than you will have to do the bleeding of air from the system (requires 1 extra person to press and release the pedal) .
The bleeding of air is as follows: press and hold brake pedal and undo the bleeding screw a bit until pedal goes down to the floor.
Release pedal only after screwing back the bleeding screw.
Repeat above steps until only brake fluid flows out trough the bleeding screw
While doing this keep an eye on the brake liquid and top up as needed .
Once this is done go and readjust hand brake handle .
cheers
Andrei

thanks for the advice shall try this one on the weekend

[mud_slut]

bled the brakes and backed off the shoes evenly and the car handles x10 better than before did notice that ive put DOT 4 in instead of DOT 3 which is stamped ontop of the master cylinder...looks like ill be changing the fluid again next weekend..

thanks for all the help again

[kyphonii]

I think dot 4 is ok in dot 3, just can't put dot 3 into dot 4 brakes.

[layback40]

Originally Posted by mud_slut

Cheers, shall do . I have a copy of the Haynes manual that i used for replacing the shoes and cylinders however a few people have mentioned that its fair rubbish.

A few people & me !!
Having thought about it for a few days, a couple of suggestions/comments;
If the main springs have become weak over time, the bias will have gone a little towards the back.
The new shoes could have had the leading edge filed off at 45deg. This used to be done back in the old days of cars with drums all round to stop them grabbing. When I did my drums a few months ago, I just got the file out & did it ~ old habit. Mine didnt grab after the replacement.
If you have an issue, it probably would be possible to design a modification using a proportioning valve that was used on some minis/1100/1500/1800. The valve worked on the rear sway bar & reduced the fluid pressure to the back brakes when the weight came off in heavy braking so preventing rear lock up.

Dot 4 & dot 3 fluid are basically interchangeable in your situation. They can be mixed without adverse effects. The main difference being the boiling point of the fluid. As you are not using it in a V8 super car or a F1 its unlikely you will have a problem with extream temperatures.
Silicone fluids can not be mixed with conventional fluid.

[mud_slut]

Originally Posted by layback40

A few people & me !!
Having thought about it for a few days, a couple of suggestions/comments;
If the main springs have become weak over time, the bias will have gone a little towards the back.
The new shoes could have had the leading edge filed off at 45deg. This used to be done back in the old days of cars with drums all round to stop them grabbing. When I did my drums a few months ago, I just got the file out & did it ~ old habit. Mine didnt grab after the replacement.
If you have an issue, it probably would be possible to design a modification using a proportioning valve that was used on some minis/1100/1500/1800. The valve worked on the rear sway bar & reduced the fluid pressure to the back brakes when the weight came off in heavy braking so preventing rear lock up.

Dot 4 & dot 3 fluid are basically interchangeable in your situation. They can be mixed without adverse effects. The main difference being the boiling point of the fluid. As you are not using it in a V8 super car or a F1 its unlikely you will have a problem with extream temperatures.
Silicone fluids can not be mixed with conventional fluid.

Thanks for the feedback, i think i might replace the springs as a precautionary measure, for $30- $50 the piece of mind / eliminating one potential cause might be the way to go.

That haynes manual can be a joke i have to pull my fan belt off and it doesnt even have the proper belt diagram or how to remove the serpentine belt. Only has instructions on how pull off the v belt for the petrol models!?!?!?

Originally Posted by kyphonii

I think dot 4 is ok in dot 3, just can't put dot 3 into dot 4 brakes.

Thanks also for the feedback on the brake fluid. My hilux mates were suggesting i could blow the seals on the master cylinder if i ran dot4 in a dot 3 system. Just out of curiosity does the clutch have its own master cylinder ? if so where does it sit. i cant seem to find it anywhere.

[kyphonii]

Originally Posted by mud_slut

Thanks for the feedback, i think i might replace the springs as a precautionary measure, for $30- $50 the piece of mind / eliminating one potential cause might be the way to go.

That haynes manual can be a joke i have to pull my fan belt off and it doesnt even have the proper belt diagram or how to remove the serpentine belt. Only has instructions on how pull off the v belt for the petrol models!?!?!?




Thanks also for the feedback on the brake fluid. My hilux mates were suggesting i could blow the seals on the master cylinder if i ran dot4 in a dot 3 system. Just out of curiosity does the clutch have its own master cylinder ? if so where does it sit. i cant seem to find it anywhere.

The blowing seals is new to me. Dot 4 is just the later version, Just better spec fluid.
Put the blowing seals in the urban myth file.

[layback40]

Originally Posted by kyphonii

I think dot 4 is ok in dot 3, just can't put dot 3 into dot 4 brakes.

If you have a read of the Australian standard for brake fluids you will find that dot 3 (type 1 in Australia) & dot 4 (type2) can be mixed either way. You could also check the ASME standard.

"My hilux mates were suggesting i could blow the seals on the master cylinder if i ran dot4 in a dot 3 system."


My guess is your hilux mates cant even read !! Sounds like way too much pub talk !! Doesnt take much intelligence to drive a hilux !!

"Just out of curiosity does the clutch have its own master cylinder ? if so where does it sit. i cant seem to find it anywhere." Yes there is, its next to the brake booster.