P38A ABS relay type..?

Bagshot · Feb 27, 2019

Hi, the relay on the abs it seems is playing up. Sometimes catch it buzzing loudly and the other day noticed the pump was running continually for a good five mins. Looking to replace the relay Inthe first instance, but seeing them at around £20- £30 a shot. A related good auto electrician can't see what the speciality is here for the cost. Same one with same "configuration" can be picked up for about a fiver.
Am I missing something here..?

wammers · Feb 27, 2019

Bagshot said:
Hi, the relay on the abs it seems is playing up. Sometimes catch it buzzing loudly and the other day noticed the pump was running continually for a good five mins. Looking to replace the relay Inthe first instance, but seeing them at around £20- £30 a shot. A related good auto electrician can't see what the speciality is here for the cost. Same one with same "configuration" can be picked up for about a fiver.
Am I missing something here..?

You are missing the fact that it is a special high amp relay. The others would not last five minutes.

Bagshot · Feb 27, 2019

wammers said:
You are missing the fact that it is a special high amp relay. The others would not last five minutes.

Cheers Wammers..I will throw this back to them..

Grrrrrr · Feb 27, 2019

wammers said:
You are missing the fact that it is a special high amp relay. The others would not last five minutes.

Surely same ampage rating would be sufficient?

wammers · Feb 27, 2019

Grrrrrr said:
Surely same ampage rating would be sufficient?

OK try one and report back.

Mark Piercy · Feb 27, 2019

Are they around 70amps with blades like rabbits teeth?
Not touched mine yet... Crap, shouldn't have said that

discool · Feb 27, 2019

The D1 ABS pump relay is identical in appearance to the item used with the RR P38.
Disco item is rated a 70 amp and is a single contact relay, but the difference with the P38 item is that it has dual parallel contacts, which could/would indicate an higher amp rating.

Bagshot · Feb 27, 2019

This one is mine..

Mark Piercy · Feb 27, 2019

Bagshot said:
This one is mine..View attachment 171123 View attachment 171124

You shouldn't have touched it...

As I said rabbits teeth.

wammers · Feb 28, 2019

It runs from a 40 amp maxi fuse. BUT it has a very high amp rating to give reliability of function.

Datatek · Feb 28, 2019

Grrrrrr said:
Surely same ampage rating would be sufficient?

Depends on other things, for example does the correct part have a built in suppression diode?

wammers · Feb 28, 2019

Would anyone who decides to skimp and not use the called out relay, please put up a post on brake failure modes when they come out of hospital.

discool · Feb 28, 2019

wammers said:
Would anyone who decides to skimp and not use the called out relay, please put up a post on brake failure modes when they come out of hospital.

Brakes will still work, but with out the ABS function if the pump relay failed.

wammers · Feb 28, 2019

discool said:
Brakes will still work, but with out the ABS function if the pump relay failed.

I'm glad you don't mend my cars. Without fluid pressure only front brakes will work hydrostatically, so hope you have strong legs. Rear brakes will not work at all.

Datatek · Feb 28, 2019

wammers said:
Would anyone who decides to skimp and not use the called out relay, please put up a post on brake failure modes when they come out of hospital.

In the event of an accident, insurance may be invalidated if brakes were to fail due to the wrong relay being fitted.
Without system pressure you need an hydraulic right leg to stop the car

Mark Piercy · Feb 28, 2019

discool said:
Brakes will still work, but with out the ABS function if the pump relay failed.

On a traditional abs system, yes. On the '38 it is the heart of the systems performance and traction control as well as the abs when needed.

Ask how I know amongst others who have the pump not work briefly or not at all.... It's a little scary to say the least....

discool · Feb 28, 2019

Mark Piercy said:
On a traditional abs system, yes. On the '38 it is the heart of the systems performance and traction control as well as the abs when needed.
Ask how I know amongst others who have the pump not work briefly or not at all.... It's a little scary to say the least....

Thanks for the straight forward clarification

it’s appreciated.

Mark Piercy · Feb 28, 2019

discool said:
Thanks for the straight forward clarification it’s appreciated.

Your welcome buddy.... We came

...down a slip road off the motorway in the bus, down to a roundabout when I had no pressure in the system...
Let me tell you!! They were NOT tyre marks left behind!!!!

Grrrrrr · Feb 28, 2019

Mark Piercy said:
Your welcome buddy.... We can down a slip road off the motorway in the bus, down to a roundabout when I had no pressure in the system...
Let me tell you!! They were NOT tyre marks left behind!!!!

You left fluid on the slip?

RangeRoller dt · Feb 28, 2019

My engine used to cut out if you stopped after a motorway run, once you lose pressure they dos take some stopping

Handbrake felt like it was jumping about in a drum down there?

New pants that night and now started using term E-brake

P38A ABS relay type..?

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