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Precautions against debris when pushing back Astra brake pistons

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terry paget:
Haynes is concerned I shall push grit back to the ABS valves when pushing back brake pistons to replace brake pads. He recommends clamping the brake flexible hoses and opening the bleed nipples to avoid this. I have been changing brake pads on cars with ABS for 30 years without problem. Are Astra ABS valves peculiarly sensitlve to grit, or is Haynes being very cautious?

Doctor Gollum:
They're perhaps ass covering, but clamping the flexi and opening the bleed nipples is the 'correct' method regardless of car. Followed by a final clamp free bleed once finished each wheel :y

This actually results in much better pedal feel even if you don't change the fluid...

Marks DTM Calib:
I have always advised this, for a number of reasons:

1) You get the ancient brake fluid flushed from the calliper (this si rarely achieved with just a fluid change)
2) It makes pressing the piston back dead easy
3) No risk to any ABS component
4) No risk to inverting the seals in the master cylinder  (and I have seen this happen!)
5) You don't risk the fluid reservoir overflowing

TheBoy:
Yes, always clamp the hoses, irrespective of whether it has ABS or not.

terry paget:
Thank you gentlemen, I shall clamp and bleed henceforth, for the reasons you give, not Haynes. I have suffered many an ABS failure, but none caused by grit in valves. Most were electronic unit failures, 2 were sensor, 2 were sensor ring splits, and one was front wheel cable failure.

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