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401 mysterious brake problem

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Old 11-07-19, 09:20 PM
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Location: Westward Ho, Devon
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Default 401 mysterious brake problem

I have rebuilt many hydraulic brake systems over the years but have encountered an odd problem. Refurbed drums, slave cylinders and new linings, bleed system, adjust for good clearance on master cylinder pushrod BUT the rear brakes do not release and if either rear bleed nipple is opened a squirt of fluid shoots out. So there is residual pressure. Disconnected the handbrake pins just in case. The front brakes work fine, going on and immediately releasing.

How can this be happening? It is as though there is a one way valve just in the rear pipe. Any ideas?

Mike Ralph, Devon, UK.
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Old 11-07-19, 09:46 PM
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Did you renew the rear flexible brake pipe? if not that may be the problem.
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Old 12-07-19, 09:21 AM
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Exactly the same thing happened to my 408 which turned out to be the flexible hose to the back axle . It had perished / collapsed internally and acted as you describe.

Mike Haig
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Old 12-07-19, 09:57 AM
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This is often caused by the flexible brake hose delaminating internally which allows fluid to pass under pressure to the cylinders but will preventing the return of fluid not under pressure - exactly like a one way valve as you rightly say.

Good luck,
Mike
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Old 14-07-19, 12:24 PM
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Well thank you all! This is a new one on me and as I already had a new pipe in the garage I fitted it and what a result. Having replaced the wheel cylinders and blamed the handbrake linkage it was as simple as a faulty flexible pipe. I would not have believed they could do that. So, never too old to learn.

Once again thank you all.


Mike
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