Vehicle & Technical > Range Rover

P38 brakes or lack of them!

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barny:
Bit confused with this one as our p38 4.6hse has now got a longish spongyish pedal that intermittantly rectifies itself. When we first got the car it had a great pedal but the brakes where a little dull sometimes needing a bit more effort than was needed, but we accepted that as being a feature of the car.

Anyhoo on sat the brakes failed and needed a damn hard shove to stop with a fairly long pedal. Quick google and found out the odd buzzing noise behind the dash was actualy the ABS PUMP repressurising the the Pressure Accumulator(this often happened since owning the car but didnt know what it was ) and came to the conclusion this was goosed. fitted a new one and after several attempts of pumping the brakes to get it up to pressure eventually we had a storming pedal and brakes that worked really really well. Went home and all was well till we tried it this mornin and its back to square one :evil:

Anyone got any ideas ? My nxt thought is to bleed the brakes as i asumed the pump would self bleed the system. The dash lights are the abs,TC and brakes light up.

muddysteve:
did you change the pump or the accumulator? i think the pump should run every third brake application and for about 3 seconds. if its running more than that the accumulator is the usual suspect

try over on rangerovers.net forum, loads of p38 info there

Rossko:
If you changed the pump without bleeding, now is the time to bleed.
There's an elaborate sequence to go through, might as well do the whole thing and so get fresh fluid throughout.

If that doesn't sort it, possibly the accumulator or pressure switch duff.

barny:
Sorry i didnt make it clear, i replaced the Accumlator as it was the cheaper part and the pump at the time was working.

Ive now since bled the system through but the typical "furthest from the master cylinder route" - im now aware of the elaborate bleeding routine and will do that later as ....... now the pump no worky! To gain access to the pump I've removed the fuse box + siren and have checked the wiring to the pressure sensor. I've no wiring diagrams (so i dont know what i should be seeing )as yet* but i had 2 live feeds to the switch and no "apparent" feed to the pumps motor. I'll not jump to any conclusions as yet.

Thanks for your help also the link to the code reading on the other thread   :D

*Nice landrover Numpty "specialists" are getting them to me in the morning

Rossko:
If you are going to poke around this, it will be well worth while to get the manual with diagrams, procedures etc e.g. RAVE disc

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