Thread: D2 question 2: Brakes.

Definitely not normal~

I get this to a certain extent as well. First pump works fine, but if I go for a second pump I get a much firmer pedal and less pedal stroke required. Figured it was due to pad knock back. If anyone knows a fix other than new rotors or wheel bearings I'd be very happy to hear!

Sent from my GT-I9100 using AULRO mobile app

I've noticed this too, but haven't felt the difference is out of the ordinary.

I had a sticky caliper which was repaired, but it still happens after the repair.

I find this only on the first application of the day.
I think it is due to the ABS block/pump relaxing while off.
Mine did this even though I had new discs, pads and a complete pressure and Nanocom bleed.
So its a bit of a characteristic , but if you have a big drop it may be pad knockoff due to a warped disc. How is it slowing down , does it pulse?

I don't think it is wheel bearings as they are sealed as a unit and from posts here , you will get 3 amigos if any are loose.
The pedal will also go down if you press the brakes with engine off and this IMHO is the ABS unit valves compressing.
Regards Philip A

No pulsing or shuddering for me, so I guess its down to the ABS unit. I notice the pedal does creep down if you hold a constant pressure, which suggests fluid is getting past something somewhere. Master cylinder?

In my case it feels like knock off, or disc brake runout. The pedal is firm after the first pump, which seems to me to be pushing the pads back into contact. If I DON'T pump then the brakes do the abs pulse. If i DO pump then the brakes are fine and strong.
It was Glen at RoverLand who told me it was sort of normal, as the wheel bearings have movement as standard, but I don't like it.
Front discs and pads, rear pads replaced 10,000k ago, with no discernible difference.

i have the exact same feeling described. mine is a 2002 td5 disco. the first pump is still does the job fine but the second pump really pulls the car up. it just makes the brakes feel so much more sensative compared to the first pump.. if i put all my weight 105kg on the brake pedal it does slowly drop but never bottoms out.

im thinking its play in wheel bearings. unless its normal?!!?

If the pedal drops slowly under pressure or needs pumping IMO the seals in the master cylinder are gone or there is air trapped in the system, the ABS modulator has no involvment in normal braking action, it has two circuits, one normally closed which will work only on ECU request and one normally open to let the fluid pass through the modulator as long as no "action"(ABS/TC/EBD/HDC) is required... presuming that there is air somewhere in the system the the best is to use both bleeding methods one after the other, first the mechanical/pedal bleed to push down the air which is trapped between the cylinder and the modulator then the tester bleed cos this one will push out the air trapped in the normally closed circuit... while bleeding with tester the programm opens the NC circuit too and activates the electric pump but it doesnt affect the part which is between the master cylinder and the modulator. I'm just saying that there is the possibility to have air left in the system as long as it wasn't bled with both methods... happened to me