Brakes what the?

[hsv91ss]

hey guys

On my VS for for a while the brakes were soft took about 3 quarter pedal to stop and apparently before I owned it you would have to pump the pedal to get pressure back or the pedal would slowly move down as you were stopped but still held however I never had that problem since I have owned it.

The car was fitted with new brakes not long before I got it, but what has me stumped is yesterday I drove the car and the brakes were so firm that I barely had to touch the pedal to stop and if I hit it too hard prob would have given me whiplash, what could cause the sudden change?

[RX25SE]

hey guys

On my VS for for a while the brakes were soft took about 3 quarter pedal to stop and apparently before I owned it you would have to pump the pedal to get pressure back or the pedal would slowly move down as you were stopped but still held however I never had that problem since I have owned it.

This sounds like a faulty (bypassing) master cylinder.
Quite dangerous.

The car was fitted with new brakes not long before I got it, but what has me stumped is yesterday I drove the car and the brakes were so firm that I barely had to touch the pedal to stop and if I hit it too hard prob would have given me whiplash, what could cause the sudden change?

This sounds like a booster fault. Most likely the reaction disc is buggered as this controls pedal feel.


Either way, this needs to be fixed ASAP, if not sooner.

[hsv91ss]

thanks for the reply so my best bet is to replace both could I use a inch cylinder and booster etc what would fit?

thanks

[ss350chev]

I will check your vacuum hose from the booster to the rocker cover to see if there is a leak before buying other parts,it maybe a rubber gromet not sealing or the hose has cracks .also check that your vacuum valve is not stuck and if the motor is sucking air thru your brake booster hose

[VrWagz1]

A 1 inch master and older style vn/p/r will work if you dont have abs. If you have abs your better off with the 15/16 master. The only thing you will need to look at is the position of the brake lines. You may need to bend them around abit. I would only do all of this if you can get all the stuff for free. If you have to buy stuff, you mise well buy the same vs gear.

[hsv91ss]

Thanks for the help guys

I will have a look a little later at all the lines and check for any leaks, and from what I can tell the booster has been replaced before as it says PBR 2006 on it, so maybe its just the cylinder and a vac hose. there currently nothing decent on ebay and it don't have abs so guess my options are a little more limited.