andremarca

I'm getting a strange vibration when i gently press the brakes on my cossie.

It feel like the ABS working but when i press a bit harder it disappears. After driving for a wile it disappears...

What could it be? could it be that the brake lines were not bled properly?

Thanks

Yogi.

i have exact the same problem...

andremarca

anyone else had the same problem? Were should i begin with?

rinus_2005

iTrader: (1)

normally i'd say warped discs, but that vibration remains all the time..

doga-ot

iTrader: (1)

I had this and it goes away doesn't happen all the time either it was warped disk

BigPeBe

I'd say warped disks too. I used to have this, if the disks aren't mentally twisted it disappears when you push the brake more, because the brake pads get a proper contact on the disk. But when gently pushing the warped disks kinda goes on and off from the pads and this creates the vibration.

Temperature changes can make the disks go from warped to straight so this could be why it disappears after a while. I also had this symptom. Also it changed with the weather too.

If the new disks get warped easily this could tell about worn bushes in the front suspension (or poor quality disks).
For some reason Sierra front end seems to be quite keen on ruining brake disks.

andremarca

I know by discs are warped, not badly but warped...

But this somehow just feels different... It looks like it's something with the pump or the abs sensors.

It's like it just pushes back when you touch it. If you keep the foot there it just goes away. Even when just barely touching it... It looks like it happens every time you touch it. Over time it completely disappears.

I'll try bleeding the brake oil first then changing disks.

martysmartie

iTrader: (1)

Does it do it at slow speed?

It sounds like ABS as you say it's like the pedal is pushing back.

Martin

BigPeBe

Ah ok this might be something different then. I doubt bleeding will help but doesn't hurt to try.

andremarca

The feeling is the same if your doing 10 or 100mph

botters

iTrader: (2)

disconnect the two plugs from the top of the brake fluid resevoir and see if it goes away if it does its abs related if it doesnt then its warped disks, wheel bearing etc..

andremarca

Thats easy enough... Didn't think of that! Will do!

cra1g

I have same problem, very anoying. I though maybe a dodgy abs sensor.