Spongy pedal

Tombies on the money,,
its chalk and cheese really.:(:D

Thanks lads.

I might as well just live with it, top up the fluid (I think some was purged when fitting the new pads) and do a flush when I have plenty of spare time.

Depending how old it is a caliper kit will help a lot.

Plus check discs are running true or you'll get knock back.

Quote:

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Originally Posted by greg smith

Mines' an 02 td5 disco and pedal had been spongy from new---with the abs upgrade I now have a much tighter and better feel pedal???? figger!!!

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Ah, but will it last??

I'm not sure if 'spongy' is the right term. If you remember drum brakes, it's more like a badly adjusted drum setup, or a disc setup with excessive runout. Mines the same, with new rotors/pads all round. No air in the system.
One quick pump and it's all good. You get used to it.

It's all running very smoothly and very straight since the rotor and pad change on all four corners. I did notice that the front calipers were quite sticky when they were off and had to be cleaned up/greased. Perhaps new D2a calipers at some point is a good idea. Direct swap I presume?

Quote:

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Originally Posted by Tombie

The issue is due to the seal groove on the caliper.

Caliper design has 'pull back' build into the seals housing so the seal rolls under pressure then rolls back slightly pulling the piston from the disc.

A change to the D2a version sees this reduced and better pedal feel.

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Aah. My locals don't know about that one. Thanks, Tombie.

Quote:

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Originally Posted by Tombie

The issue is due to the seal groove on the caliper.

Caliper design has 'pull back' build into the seals housing so the seal rolls under pressure then rolls back slightly pulling the piston from the disc.

A change to the D2a version sees this reduced and better pedal feel.

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So, is that the piston/seal assy, or the whole caliper? Front and/or rear?

Quote:

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Originally Posted by johntins

So, is that the piston/seal assy, or the whole caliper? Front and/or rear?

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Its the groove in Piston / Seal assembly...