Accumulator replacement

davek67 · Oct 19, 2009

2000 p38 4.0 with new engine 300 miles ago - and new rad, battery, water pump, thermostat, hoses, alternator, heater matrix, exhaust and respray in previous 12 months!!

The brakes failed totally. Stopped car tried again and everything ok - then they went again 2 days later - diagnostics showed nothing obvious - everything checked out by local garage and typically nothing obvious showing and brakes working fine!!

Anyway after much googling we've come to the conclusion that a faulty accumulator may be the problem. The pump works for 5 - 10 seconds on start up - the first fail had it running for a lot longer though - hasnt done it since and I'm pretty sure it hasn't caused it to burn out.

What is the proceedure for changing one of these please?

Thanks, David

chrispiec · Oct 19, 2009

this is the one i used and it went ahead fine.

ABS Accumulator Replacement on a Range Rover 4.0/4.6/P38

wammers · Oct 19, 2009

davek67 said:
2000 p38 4.0 with new engine 300 miles ago - and new rad, battery, water pump, thermostat, hoses, alternator, heater matrix, exhaust and respray in previous 12 months!!

The brakes failed totally. Stopped car tried again and everything ok - then they went again 2 days later - diagnostics showed nothing obvious - everything checked out by local garage and typically nothing obvious showing and brakes working fine!!

Anyway after much googling we've come to the conclusion that a faulty accumulator may be the problem. The pump works for 5 - 10 seconds on start up - the first fail had it running for a lot longer though - hasnt done it since and I'm pretty sure it hasn't caused it to burn out.

What is the proceedure for changing one of these please?

Thanks, David

Simple, depressurise system by pressing pedal twenty or thirty times. Unscrew old unit, screw in new one, tighten. You will need a chain type filter tool for this as they can be quite difficult to remove. The accumulator is nothing more than a pressurised reservoir, a steel sphere with a rubber ball inside it with the opening sealed by a plastic cup, but the ball is pressurised to 80 bar with Nitrogen. The ABS pump fills the steel sphere with fluid against the pressure in the ball compressing it, to give the ABS a reserve of pressurised fluid to use.

davek67 · Oct 19, 2009

thanks for the help - will pass it on - I dont do anything as it has a tendancy to go wrong in ways that no-one has seen before!!

rasheed · Oct 23, 2009

Yes but the brakes aren't supposed to fail if there is a loss a pressure, just become very hard to use? Isn't there exactly this kind of failsafe built in? What lights came on in your dash? Just wondering if its not the famous modulator failure that I posted about earlier. You can do a search for my posts or look on roverrenovations for a link.

Accumulator replacement

davek67

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chrispiec

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wammers

No longer with us, RIP

davek67

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rasheed

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