Brake Fault - Help - Page 3

bearhouse · 22nd May 2024, 09:36

The pins on the original pump did have green mould on a few pins. To be sure, to be sure as my mum would have said, I'm going to cut the old plug off and solder and heat shrink on a replacement. Surely then, all will be well. I just hope the pins on the pump are all ok and not bent.

Fingers crossed.

xsport · 22nd May 2024, 14:05

Can you not use a cleaning fluid brushed in and left to soak. Really would save you a lot of hassle if done carefully.

bearhouse · 23rd May 2024, 13:47

Unfortunately the plastic face of the connector has been damaged so despite the hassle, I’ll have to replace the connector.

bearhouse · 25th May 2024, 10:48

So the update is... Thanks to Terry Shaw, I have another ABS pump connector / plug. I've cut and spliced it in. Cleared all faults on TOAF and given it a try. The Brake warning light is now off as is the ABS warning so definite progress. The traction control warning is on so for now, I've just disabled it in IPK / TOAF.

So, I can drive without any warning on. However, there is a brake issue... When braking, the brake pedal pumps, you can feel and hear a noise under foot.

Any thought as to what may be the cause?

SD1too · 25th May 2024, 11:44

Quote:

Originally Posted by bearhouse

When braking, the brake pedal pumps, you can feel and hear a noise under foot.

Is it a rhythmic pulsating accompanied by a hammering sound?

Simon

bearhouse · 25th May 2024, 12:32

It is a rhythmic pulsating sound or sensation on the brake pedal. I'd call it a clonking sound. It only seems to happen at slow speed, maybe 15MHP and lower.

SD1too · 25th May 2024, 12:43

If the pedal feels as if it's being sucked away from your foot pressure in time with the noise, that sounds like the ABS operating.

Simon

bearhouse · 25th May 2024, 13:32

That’s probably what it feels like but why would the ABS be activated?

SD1too · 25th May 2024, 13:44

Funnily enough I'm assisting a friend with a similar problem except that his noise isn't a definable clonking, more a coarse grinding but, like yours, occurs only when speed has reduced to walking pace.

Current theories are rust particles causing a sensor signal equivalent to a locked wheel (posted by Arctic) or a wheel bearing (on DMGRS' parts listing). A garage is initially going to blow out the area around the sensors so I might have an answer for you early next week.

Simon

bearhouse · 25th May 2024, 14:02

Terry Shaw has said, ‘It's normally rear rust build up on the rear back plates, behind the wheel bearing abs pick up points.
Rear brakes is my first point of call with that problem' So you’re both saying the same thing.

25th May 2024, 12:43	#27
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,589 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	If the pedal feels as if it's being sucked away from your foot pressure in time with the noise, that sounds like the ABS operating. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

25th May 2024, 13:44	#29
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,589 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Funnily enough I'm assisting a friend with a similar problem except that his noise isn't a definable clonking, more a coarse grinding but, like yours, occurs only when speed has reduced to walking pace. Current theories are rust particles causing a sensor signal equivalent to a locked wheel (posted by Arctic) or a wheel bearing (on DMGRS' parts listing). A garage is initially going to blow out the area around the sensors so I might have an answer for you early next week. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

22nd May 2024, 09:36	#21
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	The pins on the original pump did have green mould on a few pins. To be sure, to be sure as my mum would have said, I'm going to cut the old plug off and solder and heat shrink on a replacement. Surely then, all will be well. I just hope the pins on the pump are all ok and not bent. Fingers crossed.

22nd May 2024, 14:05	#22
xsport Posted a thing or two rover 75 club se Join Date: Apr 2011 Location: Leicester Posts: 1,741 Thanks: 358 Thanked 419 Times in 310 Posts	Can you not use a cleaning fluid brushed in and left to soak. Really would save you a lot of hassle if done carefully.

23rd May 2024, 13:47	#23
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	Unfortunately the plastic face of the connector has been damaged so despite the hassle, I’ll have to replace the connector.

25th May 2024, 10:48	#24
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	So the update is... Thanks to Terry Shaw, I have another ABS pump connector / plug. I've cut and spliced it in. Cleared all faults on TOAF and given it a try. The Brake warning light is now off as is the ABS warning so definite progress. The traction control warning is on so for now, I've just disabled it in IPK / TOAF. So, I can drive without any warning on. However, there is a brake issue... When braking, the brake pedal pumps, you can feel and hear a noise under foot. Any thought as to what may be the cause?

25th May 2024, 12:32	#26
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	It is a rhythmic pulsating sound or sensation on the brake pedal. I'd call it a clonking sound. It only seems to happen at slow speed, maybe 15MHP and lower.

25th May 2024, 13:32	#28
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	That’s probably what it feels like but why would the ABS be activated?

25th May 2024, 14:02	#30
bearhouse Avid contributor Rover 75 Join Date: Aug 2009 Location: Herts Posts: 118 Thanks: 0 Thanked 0 Times in 0 Posts	Terry Shaw has said, ‘It's normally rear rust build up on the rear back plates, behind the wheel bearing abs pick up points. Rear brakes is my first point of call with that problem' So you’re both saying the same thing.