nearside rear brake grab issue

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Polly's Dad

Member
Posts
12
Location
Watton, Norfolk
Hello everyone,
My name is Nick, and I have a 2006 Range Rover Vogue, 3.0Td. and recently, it's started to develop a concerning fault that I just can't figure out.
It's started to "Grab" on the nearside rear caliper, especially after you use an extra dose of the Go faster pedal. I replaced the caliper, but it's still grabbing on when driving, and getting the whole hub extremely hot.

Could it be the ABS pump failing, and providing pressure down the line that feeds that particular wheel? I've heard of these valves/modules failing due to something with the internal valves sticking or failing to seal and returning to it's normal working state, therefore causing pressure to still be evident within the brake line....

Or is it possible for a brake servo to create pressure down just 1 brake line while the engine is under load, like accelerating to maintain speed on an incline, or overtaking...If I drive it from a period of rest, like over a 24hr period, and take it steady with the throttle, the problem is hard to detect, but if you hit the loud button to overtake, or anything like that, the brake almost instantly grabs on, and you can hear the rumble and feel a vibration from the rear.....

Any pointers to a possible cause/solution within this forum would be greatly appreciated, Thanks...
 
Hello everyone,
My name is Nick, and I have a 2006 Range Rover Vogue, 3.0Td. and recently, it's started to develop a concerning fault that I just can't figure out.
It's started to "Grab" on the nearside rear caliper, especially after you use an extra dose of the Go faster pedal. I replaced the caliper, but it's still grabbing on when driving, and getting the whole hub extremely hot.

Could it be the ABS pump failing, and providing pressure down the line that feeds that particular wheel? I've heard of these valves/modules failing due to something with the internal valves sticking or failing to seal and returning to it's normal working state, therefore causing pressure to still be evident within the brake line....

Or is it possible for a brake servo to create pressure down just 1 brake line while the engine is under load, like accelerating to maintain speed on an incline, or overtaking...If I drive it from a period of rest, like over a 24hr period, and take it steady with the throttle, the problem is hard to detect, but if you hit the loud button to overtake, or anything like that, the brake almost instantly grabs on, and you can hear the rumble and feel a vibration from the rear.....

Any pointers to a possible cause/solution within this forum would be greatly appreciated, Thanks...
If it's the same as the P38 I would say caliper slides sticking, strip down , clean and copper slip on re assembly.check the Technical archive,top right of home page @Saint.V8 did a how to if I remember correctly. Welcome.
 
I believe there has also been cases were the brake flexie has been crimped to stop fluid leaking while work is being done and it has caused the pipe to not let the fluid bag keeping the brake on, check sliders first then look at hose.
 
Hi Tomcat, as for the sliders, they are looser than a greasy pig on a water slide.... the whole exterior mechanics of the calipers have been stripped, cleaned and re-greased.... and the pistons all retract real easy.... it's developing pressure down just 1 brake line when driving.... and can't fathom out why...
 
I believe there has also been cases were the brake flexie has been crimped to stop fluid leaking while work is being done and it has caused the pipe to not let the fluid bag keeping the brake on, check sliders first then look at hose.
Hello Brian, I am currently replacing the pair of rear brake pipes and flexi's, in case that is the cause, but the pistons all retract very easy when you wind them in with the piston tool...
 
Hi Tomcat, as for the sliders, they are looser than a greasy pig on a water slide.... the whole exterior mechanics of the calipers have been stripped, cleaned and re-greased.... and the pistons all retract real easy.... it's developing pressure down just 1 brake line when driving.... and can't fathom out why...
Are the pads sticking? You can call me Alan Nick;):D
 
Are the pads sticking? You can call me Alan Nick;):D
Hi Alan, as for the pads, they all move very well, as the calipers have all been extensively refurbished, as to remove the road crud and build up... to the point of having them off the car, and treated to a good scruffing with a Dremmel and a medium wire brush attachment, to get in all the nooks...
 
I'm at a loss as to what would cause pressure down this one particular brake line when I'm driving...
Check the brake Flexi as Brian posted.if you take the wheel off and get someone to press the brake pedal and release it by cracking off the pipe unions you should be able to isolate where the pressure is held ie it the caliper releases when you crack the metal pipe to Flexi then I would go with your idea if at the Flexi to caliper then that's the problem, hope that makes sense;)
 
I have it booked in at a local garage that I trust, as the owner is a Range Rover owner and a fan of these cars, he seems to know his stuff. He'll go through some things, including suggestions made here, as I have printed them off for him to peruse over.... thanks everyone for your time and help, it's very much appreciated. If anyone has any other ideas or probable causes, please feel free to ping them here, and I'll make sure that your suggestions are forwarded on to the garage. Thank you all... Nick.
 
I had the same issue not long ago after new pads were fitted but it was fixed with a new caliper. Unless your new caliper is faulty.
As an update for you all, my local garage had the car for 2 weeks o_O and tried a few fixes, but always coming up with the same result.
Then they tried swapping the 2 rear calipers around, to see if the problem remained on the rear nearside, or followed across to the offside....
VOILA!... the swap caused the offside to stick, and so the "New" calliper that was fitted, was indeed faulty, and had a tight seal, not allowing the piston to relax
therefore, causing the pads holding on.... so another new calliper, a full system bleed using an electric pump that replaces 100% of the fluid, 2 rear brake pipes and flexi's,
an MOT, for £470, inc. VAT, parts and labour.... so now I'm in a dark room with red wine, biscuits, and the cat, while the wife hides all the sharp objects and lengths of rope...:oops:
 
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