rover86

rover86

Member
Hi guys, just returned from town & the abs pump will not stop running. I have unplugged the power plug to it, the pump was quite hot. RRC 1994, any advice would be most welcome. Genral mechanice are no problem for me but I have not come across one of these pump type systems before. I really must get out more.!!:confused:
 
Stuck relay...common fault or bust pressure switch....again common
 
Datatek said:
Pump should still stop with a failed pressure vessel, it will just run with every brake press.
As Saint said, relay most likely, or pressure switch.
Click to expand...

Thanks to all the replies, I'm thinking it is possibly the pressure vessel, I waited till the pump eventually stopped, applied brake & 2nd press on the pedal it started the pump, ran for about a minute before it stopped. Will try the pressure switch first as that looks the easiest & cheapest.
 
rover86 said:
Thanks to all the replies, I'm thinking it is possibly the pressure vessel, I waited till the pump eventually stopped, applied brake & 2nd press on the pedal it started the pump, ran for about a minute before it stopped. Will try the pressure switch first as that looks the easiest & cheapest.
Click to expand...

From your description above it is most likely the accumulator.....
 
rover86 said:
Thanks to all the replies, I'm thinking it is possibly the pressure vessel, I waited till the pump eventually stopped, applied brake & 2nd press on the pedal it started the pump, ran for about a minute before it stopped. Will try the pressure switch first as that looks the easiest & cheapest.
Click to expand...
If the pressure switch is the same as the P38, it's an arm and a leg if you can even find one. Again, as Saint said, pressure vessel ( accumulator) is most likely.
 
Try accumulator first. Did mine two weeks ago ('91 RRC), accumulator (genuine) was £100.00 delivered from Island 4x4, an easy job BUT, you have to bleed the system and this can be a nightmare, make sure you have at least 5 litres of brake fluid available. If you're lucky it will all bleed easily but the ABS system can take a lot of fluid to bleed. make sure you follow the workshop manual bleeding procedure to the letter.

Once done the pump should run for no more than 45 secs to pressurise and if all is good, the pump shouldn't come on again for 4 or 5 presses of the brake pedal and then only run for a short time to repressurise. HTH
 
Even if the accumulator is knackered and has lost all it's Nitrogen charge, the pump should still stop at some point when the system is up to pressure. Even though it will start again pretty quickly if brake is applied. Accumulator may or may not be knackered but it's certainly not that causing pump to run continuously. Sounds like the pump is not making pressure for some reason to me. If the switch was duff you would expect the pump to burn out running against pressure at some stage.
 
wammers said:
Even if the accumulator is knackered and has lost all it's Nitrogen charge, the pump should still stop at some point when the system is up to pressure. Even though it will start again pretty quickly if brake is applied. Accumulator may or may not be knackered but it's certainly not that causing pump to run continuously. Sounds like the pump is not making pressure for some reason to me. If the switch was duff you would expect the pump to burn out running against pressure at some stage.
Click to expand...
Tony, read his second post with further details!:D
 
Thanks for all the replies, accumulator changed, along with pads front & rear & changed some of the rusty pistons too, bleeding......bit of a pain but all spot on now. I'll just move onto the next thing which needs sorting now...no abs on the front axle as someone has changed it !!!
 
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