Thread: VS Commodore BRakes

VS is 4 wheel disc.not known for positive pedal with cold pads.

some utes have rear load pressure limiter--lever connected to diff to adjust max rear pressure.

for a normal ute 1085-1086 pads
in the dealer we used a shandy pads for the front--different compound inner outer,one suits colder application.VN VP wouldn't stop when cold and last VR=VS I drove was much the same.the disc is different,but they have a different booster setup.

work been buying stealth pads-it has a soft backing for noise reduction that allows the pad to twist in the holder..they also been chewing out the inner pads and have a dreadfull feel.rego brake test is ok when new pads.

some of the worst feeling brakes i have ever encountered, cold in a v8 auto they are bordering on dangerous. don't know how these vehicles pass safety standards

jc

Maybe I misled y'all
Maybe I used the wrong descriptor .
Instead of fade, I should have said that the pedal slowly/bit faster than slowly travels to the floor on the first application, almost feels like air, but as I said, none in it at all. I'll check again coz maybe there is a slight leak but I am not losing any fluid, nor can i see any wetting.

After the fluid change and bleed, the brakes are great, except for the floor travel which I was trying to fix!

The proportion valve is working but it doesn't feel like that is the cause.

The fluid was very (200000+) old and had goobers in it. I changed the master cylinder as it is common for fluid goobers to restrict the non return/pressure valve leading to these exact symptoms.

Maybe those same goobers have gummed up the pressure valves in the ABS module as I now notice that first application in the morning, the ABS gives a little flutter or shudder. mmmmmm


And yes, I only have the POS because it was free!

Ralph

piston seals.hoses.

not had to work on ABS units-with old age.the electric side often had failed by 200 000Km.

I replaced hoses a few times as the expanded when you applied----but it didn't fix it.

always had good results replacing calipers--normally upgrades.
not unusual for single piston caliper to flex or the pedal.

Thanks Davehoos,
Yes my feelings exactly. It has done 340000 all hard km!

I will systematically change the flex lines, then pistons (maybe calipers) I just have to get to the bottom of it!

Cheers
Ralph

I came across an old post on a commodore forum which suggested that the ABS modulator was not able to be bled 'manually'. IE one has to bleed it via the diagnostic computer. I could believe this as nanocom includes a bleed function on Disco ABS! Reading further, one chap said he had success with a less scientific method. He continued to work the ABS by braking on a gravel road, in order to force any air trapped in the ABS module to be expelled.

I tried it and the results are encouraging. I'll bleed a few more times and activate the ABS a few more as well and let y'all know how it went.

Ralph

All fixed! I am chuffed. I am staggered by the amount of air hidden in one dodgy commodores ABS module.

All fixed!
Ralph

did you bleed at the module pipes or at the calipers.