Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 30th June 2022, 09:58   #1
7T5
Gets stuck in
 
7T5's Avatar
 
Rover 75 saloon

Join Date: Jul 2015
Location: East Lothian
Posts: 838
Thanks: 930
Thanked 246 Times in 185 Posts
Default ABS parking sensors and handbrake

I have a few issues, with the car, not me honest.
I have a 2004 cdti deisel.
Front drivers wheel bearing was replaced April, and then the ABS light came on. The speedo stopped working etc. A new abs sensor was fitted and the light went off, and the speedo is working. There is still an issue however.
Under light braking you feel the brakes grind, and the pedal pulses like the abs is kicking in. What could cause this? Not sure if the garage used a oem sensor or not.
My parking sensors are also on the blink. I don't think its the switch as this was replaced a few years back and the reverse lights work. When you select reverse they all sound constantly. If you go out of reverse and then back in there is no sound and they don't work.
Lastly the handbrake is poor. All cables/ rear back plates changed a couple of years back. What can be done to sort this out please?
Thanks in advance
7T5 is offline   Reply With Quote
Old 30th June 2022, 10:25   #2
Jeff Turbo
Loves to post
 
MGZT cdti

Join Date: Mar 2011
Location: Lincoln
Posts: 471
Thanks: 5
Thanked 28 Times in 24 Posts
Default

If the brake pedal is vibrating that would normally be a front or rear disc issue
Parking sensors problem mean that one or two are not working. If you turn the ignition on and put the car into reverse, go round the back or the car and put your ear to each sensor. you should hear a clicking noise from each, if one is faulty then you wont hear it and that one needs replacing
Hand brake could be either the shoes not adjusted correctly or the hand brake compensator needing replacement/adjustment
__________________
1958 White Ford Consul Convertible
1965 Gold Ford Zodiac Executive
1997 Blue Jaguar Xk8 Convertible
2004 Monogram Poseidon MGZT cdti
2004 Pearl Black MGZT 260
Jeff Turbo is offline   Reply With Quote
Old 30th June 2022, 14:48   #3
Savestones
Regular poster
 
Savestones's Avatar
 
MG ZT-T

Join Date: Dec 2021
Location: Arnhem, Netherlands
Posts: 62
Thanks: 10
Thanked 6 Times in 6 Posts
Default

Quote:
Originally Posted by Jeff Turbo View Post
Hand brake could be either the shoes not adjusted correctly or the hand brake compensator needing replacement/adjustment

Check out the how to page (https://www.the75andztclub.co.uk/ind...?thepage=howto) for a step by step guide on tightening the handbrake.


The ABS problem has been described on this forum before. See https://the75andztclub.co.uk/forum/s...=282109&page=2. From what I have read on here, the main problem is the magnetic ring becoming dirty, giving an inconsistent reading. You can check which wheel is the offending wheel using this test: https://www.the75andztclub.co.uk/for...d.php?t=139231. Mark with chalk on the tire every time the voltage switches between 0.7V and 1.7V. You should end up with 46-48 chalk lines, which should be evenly spaced out. The pattern of chalk lines also gives some indication about what is broken, but I only remember reading something about that on here and I don't remember what pattern indicates what

Last edited by Savestones; 30th June 2022 at 14:57..
Savestones is offline   Reply With Quote
Old 30th June 2022, 14:54   #4
xsport
Posted a thing or two
 
rover 75 club se

Join Date: Apr 2011
Location: Leicester
Posts: 1,601
Thanks: 358
Thanked 419 Times in 310 Posts
Default

the crunching noise does not sound healthy.Was the bearing put in properly ,without damage to the bearing and reluctor .. just a thought .
xsport is online now   Reply With Quote
Old 3rd July 2022, 11:02   #5
hogweed
I really should get out more.......
 
Vauxhall Insignia CDTi; MG TF 135

Join Date: Jan 2010
Location: Norn Iron
Posts: 2,942
Thanks: 942
Thanked 378 Times in 297 Posts
Default

I had exactly the same problem as you with the ABS. Speedo stopped working, TOAF confirmed front o/s sensor faulty.


Had it replaced; speedo started working again... but I retained the other symptoms, including the weird crunchy bit, and the ABS light came on.


My Rover man found that the rear n/s was also at fault (rust on the sensor, I think) and sorted it all out.


Weird that two related but separate problems seemed to coincide, but there you go - that's a couple of years ago now, and all fine since.


Can't remember what you said in your thread about the handbrake, but have you replaced the compensator?
__________________
Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.
hogweed is offline   Reply With Quote
Old 3rd July 2022, 13:06   #6
macafee2
This is my second home
 
Rover 75 Saloon & Tourer

Join Date: Sep 2012
Location: Lincoln
Posts: 14,890
Thanks: 1,630
Thanked 3,032 Times in 2,181 Posts
Default

The rear handbrake could be a stretching compensator, has this been placed with a modified one? No point fitting a new unmodified one.
The rear drums which are part of the rear discs could be pitted and so there is "little" for the shoes to press against, the shoes could be dirty. Shoes not properly adjusted?

macafee2
macafee2 is offline   Reply With Quote
Old 14th July 2022, 14:57   #7
7T5
Gets stuck in
 
7T5's Avatar
 
Rover 75 saloon

Join Date: Jul 2015
Location: East Lothian
Posts: 838
Thanks: 930
Thanked 246 Times in 185 Posts
Default

Thanks for all the help. I think the bearing was fitted correctly yes. Mechanic has not had a chance to look at it yet, i will pass the info to him
7T5 is offline   Reply With Quote
Old 14th July 2022, 19:15   #8
RogerHeinz57
I really should get out more.......
 
RogerHeinz57's Avatar
 
A Reasonably Priced Car

Join Date: Jan 2014
Location: Burton Latimer
Posts: 2,530
Thanks: 408
Thanked 1,064 Times in 712 Posts
Default

Quote:
Originally Posted by 7T5 View Post
Thanks for all the help. I think the bearing was fitted correctly yes. Mechanic has not had a chance to look at it yet, i will pass the info to him
Another potential area to consider investigating would be the new sensor may have an issue with not collecting the full cycle of magnetic elements from the new bearing because the gap of the new sensor may be too large, and not collecting the pulses correctly, this could be considered as "The Air Gap"
This happened to me on a few occasions following replacement sensors in the front end, a simple process after extracting the sensors, file down the metal shoulder by a small fraction and ensure the hub where it enters is clean and corrosion free so the sensor sits correctly where it should be. Following this but observing only a fraction to be filed away has fixed the issues. Aftermarket ones work as good as genuine ones as long as the air gap is right.
RogerHeinz57 is offline   Reply With Quote
Old 14th July 2022, 21:54   #9
Typhoon190
This is my second home
 
MG ZT-T 190 Monogram Typhoon

Join Date: Jan 2009
Location: Oxfordshire
Posts: 4,704
Thanks: 328
Thanked 557 Times in 443 Posts
Default

The ABS sensors are often corroded solid if still the originals. If the garage have resorted to drilling the original out, they could have damaged the sensor ring on the now new wheel bearing. Even the slightest nick could cause the senor to think the wheel is locking up momentarily.
Typhoon190 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 21:59.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd