Quote:
Originally Posted by T-Cut
The effect doesn't happen with the engine running. There are several old threads discussing it (search for 'SPP' for some of them). It's reported that SPP is not observed when a T4 is used to bleed the brakes. (This is the basis of my query in Post 6). If that's a real effect and not simply experimental variance/operator bias, then what's the difference in the state of the brakes after each process? I'd love to find a convincing answer.
TC
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I ended up with SPP after the rear brake line burst on my way home from work. Once replaced I had several goes at conventional bleeding myself, plus pressure bleeding at a local independent garage.
That all made the SPP better but still present, so it had a T4 bleed and air did come out of the secondary ABS circuit.
Was enough to convince me that SPP is caused by trapped air in the ABS modulator, but you shouldn't get it if you bleed with the ignition off.