Thread: PUMA brakes fail rego check ........

Originally Posted by BilboBoggles

Better pedal on second press is likely to point to play on the wheel bearings.

Really .......

There is no indication of a wheel bearing issue.

But I will check it out, happy to check and try anything at this stage.

Originally Posted by chopper

second pump gives a better pedal , indicates air in the system somewhere.
clamp the hose/hoses to each wheel one wheel at a time and apply the brake each time .If it gets better then the problem is at that calliper.

Not exactly its a common mistake made with diesels hit the pedal a couple of times and it gets hard like there's air in the system but actually its just that the vacuum pump is slow. I don't know how many inches a puma pump pulls but you want about 25" at idle

If it has only been bled normally, then a pressure bleed may be worthwhile, as the rush of brake fluid will better dislodge residues as well as any air that is difficult to remove with manual bleeding.

My wife's Hyundai had new rotors and pads fitted by the dealer last service. I drove it home and nearly wiped myself out the first time I had to brake solidly. There was hardly any. Now I know that new pads have to be bedded in but these were ridiculous, just like there was no vacuum. However since they bedded in they are now great but it took around 500km to bed in.

Pump the peddle so it's hard and then start the engine,the peddle should drop 1/2'',if it doesn't you have no vacuum,even with ABS the wheels will lock up,the ABS unlocks the wheels,if they don't lock the ABS won't work. Pat

,even with ABS the wheels will lock up,the ABS unlocks the wheels,if they don't lock the ABS won't work. Pat[/QUOTE]

WRONG.

Chopper,how do you think ABS works?. Pat

I wonder what's wrong with the brake tester of a mates as I struggle to get the Deefer passed and the brakes are pretty much new?

In use they work fine and it pulls up nice and straight. All I can think of it's the 33's working against it.

Any play at all in the wheel bearings will give a longer than normal pedal, and any degree of pad wear can allow pad knock off, again giving a longer than normal pedal.

Any time driving dirt I always give a confidence tap coming into a corner as the pads will often knock back a little, particularly when pressing on.
It's just habit