Hi i'm new to this forum so go easy on me, I'm a novice with cars!
Recently I bought my second Corolla, a 2L Diesel Hatchback. I heard a grinding/squealing sound from the front brakes so I got the front brake pads changed.
Kay the problem is that now when breaking at a low speed (just before the car stops) there is a bad shudder in the brake pedal. It sounds like the ABS kicking in for a second and then the car stops. At any other speed the brakes work fine.
I brought it back to the garage (not a Toyota) and the only explanation they could come up was that one of the brake discs (?) has a ridge in it that only seems to go 2/3 of the way around the disk. They said to see if the pads settle in after a few weeks?
I guess I'm asking why the car hadn't these problems before the break pads were changed? And I guess I should say the garage in question aren't dodgy or anything. Any help would great, thanks a lot.
It sounds like the brake pads are shuddering as you come to a stop. This problem is commonly made better with a pad change, not worse. Have them check to be sure all the anti-rattle pads and springs are in place on the pads. Some (cheaper) pads don't have them. You might wait to see if they break in, but I doubt the problem will get better on its own.
between this forum and another local one Ive had four or five different reasons that could be causing this. moneys tight at the moment so im trying to avoid another trip to a garage. I dont think the pads are going to bed in so Im wondering if the disks are going to have to be replaced?
I've seen tutorials on on how to change the disks and reckon i could do it but 150 euros (cost of two new disks) is a lot of money at the moment so I dont want to go ahead and do it, if ultimately these are not the problem.
Any comments or advice gratefully taken?
If the pads don't have the anti-rattle shims or springs, that shouldn't be your expense. If the brakes weren't shuddering like that before, it should be up to the garage to make it right. They might could cut the brake rotors (shaving them) to make them completely flat again. That often helps, and I've had that done on pretty much every car I've owned, with good results. That's often not expensive. There are places here in the 'States that will let you carry your rotors in, and they'll cut them for $15 each. That's much cheaper than $40 each for a quality new rotor. I'd much rather cut the stock Toyota rotors than buying cheap aftermarket replacements. You most likely don't need new rotors, unless your current ones are grooved real bad. Cutting (shaving) them is a very conventional practice, and most garages will have a lathe (machine) to do that (although it is getting less common, as they'd rather you buy new rotors, to help their bottom line).
you could try a bedding procedure after giving the rotora a sanding to see if that would help.
i would also suggest you visit the stoptech website for indepth details on reasons for shudder and proper bedding in procedures. you can bed most pads to most rotors unless yoou get into exotic materials like carbon and such. so you've got nothing to lose with attempting a bedding in procedure. just remember DO NOT COME TO A COMPLETE STOP while bedding pads...
thought I'd give an update on this.
Had a few mechanics look at this and unfortunately no one could give an answer. The rotors were definitely in need of replacing so I went ahead and replaced these and put new decent brake pads on. Problem still remains, a shudder only at very low/stopping speed in the brake pedal. I don't see the point in replacing the calipers as I think this is a case of good money after bad. I'm not too put out replacing the rotors as they needed replacing but now I'm worried about the ABS.
I'm wondering why no abs light comes on when the brakes shudder and they work fine when driving normally?
I'm wondering why no abs light comes on when the brakes shudder and they work fine when driving normally?
The ABS light doesn't come on because, as far as the car is concerned, there's no problem. If the "shuddering" is what I'm thinking it is, it's just a function of the friction coefficient between the pads and the rotor.
It's exactly like this: take your index finger and push it along your desk surface at a 45 degree angle, like you were pushing a piece of paper. Push fast enough and it slides smoothly over the surface. But slow down almost to a stop, and it'll get "sticky" and start jumping along.
This is exactly what happens with brake pads. Usually, I've found new brakes to do it the least. I guess as brakes age, the coefficient of friction changes in the pads and rotors and the phenomenon gets worse. I'm not sure what to suggest doing. It sounds like you've replaced the pads and rotors already. That's all you can reasonably do I'd say.
thanks for the reply.
the example you gave makes sense but surely every car would eventually do the same?
Anyhow totally wiped out my car money for the moment so i'm at a loss as to what is causing this and can't afford to work through a check list. The dealer said it would be very unusual for the abs unit to be faulty.
I'm definitely no expert but so far the best I can come up with is faulty calipers, maybe faulty bearings or air in the brake fluid or abs system. Its killing me though, my first corolla gave exactly zero trouble.
The fact that you didn't have the problem before the new brakes were installed REALLY tells me that it's either faulty brake pads or faulty installation. I highly doubt bad calipers or anything else, based on what I think the issue is based on your description.
Yeah i'm definitely with you on the faulty installation. However the discs and pads were replaced by a different mechanic/garage so I think they're fine this time.
I've finally hunted down some info on the internet and this is not the solitary problem I thought it was. I've got some advice as I've gone along but due to my own lack of knowledge I don't always understand whats being said to me!
The sound is definitely the abs kicking in (duh for me) and in toyotas and other makes the first culprit is usually the wheel speed sensors. I'm wondering if the first garage could have damaged one of these? Or do you guys think I'm chasing my tail here.
Most of the things I've read the internet seem to say this fault will not show on diagnostic software and usually the abs dash light wont show either.
One easy thing to do: pull the ABS fuse and go for a drive. If the problem persists, it's probably not ABS-related, but something mechanical with the brakes themselves. If the problem goes away, then it probably is something in the ABS kicking in.
Hi i'm new to this forum so go easy on me, I'm a novice with cars!
Recently I bought my second Corolla, a 2L Diesel Hatchback. I heard a grinding/squealing sound from the front brakes so I got the front brake pads changed.
Kay the problem is that now when breaking at a low speed (just before the car stops) there is a bad shudder in the brake pedal. It sounds like the ABS kicking in for a second and then the car stops. At any other speed the brakes work fine.
I brought it back to the garage (not a Toyota) and the only explanation they could come up was that one of the brake discs (?) has a ridge in it that only seems to go 2/3 of the way around the disk. They said to see if the pads settle in after a few weeks?
I guess I'm asking why the car hadn't these problems before the break pads were changed? And I guess I should say the garage in question aren't dodgy or anything. Any help would great, thanks a lot.
Just a thought: Pull each caliper and inspect and lube the slider pins, looking for anything weird about the calipers or the pads. Good luck!
Okay I pulled out the abs fuse and sure enough the problem stopped. I was tempted to leave it out but I've been advised that I shouldn't for insurance reasons.
I'm pretty sure now its the wheel sensor in the front right hand wheel. Any advice for what I should look for. Thanks in advance.
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