brake issue while in slow km?
hi guys bought a vs while back had no problems, ss off a guy a little but now when braking while stopping the last little bit say under 25km/ph its like the pedal has a bounce back motion, you feel it in the pedal but other wise its fine, any ideas?? its also got new pads, discs and rotors when i bought it 2-3 months back.
Cars cost too much.
I'd say, look into a machine job on your rotors and see how that treats ya.
Torana Addict
New pads, discs and rotors? Must be an awesome brake setup
What pads and discs did you use?
i bought this car off like a private collector, he didnt like seeing the rust on the rotors so he replaced everything, its all stock, i have no idea what pads and discs he used, this bloke was very padantic so wouldn't go past him using all holden parts
Torana Addict
Should have driven the ####in thing if he didn't like the rust on the rotors.
Possibly warped rotors, machine or replace and see what happens.
lol, good call. yeah it has me stumped cause i would had thought a viabration when stopping like from 100km/ph but only feel it like under 20km its weird.
Cars cost too much.
You probably lessen the pressure at a low speed thus the pulsation in the pedal.
To throw a spanner in the works, does your car have abs? I have seen this on many occasions only at low speeds where one of the wheel speed sensors drops out so the abs thinks you have locked up 1 wheel and kicks in. It's not real aggressive like in a full blown panic brake but it shudders the pedal. For the cost I would remove your sensors and clean them.
Yeah mate it's abs fitted, it seriously feels like it's scrapping but I feel it in pedal, where and how to clean the sensors? Cheers
i would recommend before going to the trouble of removing sensors. remove the abs fuse and try to brake. if the pulsating stops its abs related. if not try machining etc
Donating Member
The ABS light should come on when the ABS motor kicks in. The sensors are sealed in the hub and cannot be cleaned unlike many other cars.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
Real cars are steel cars.
Really?Originally Posted by hako
Im sure mine doesn't light up when it goes into ABS braking.
If I told you I was a compulsive liar, would you believe me?
great idea reeceo, i will do that and see how i go.
Take it out/Take it Back
First off...can you hear the ABS module kicking in when you brake? If not, dont bother ####ing around with ABS this or ABS that.
Did you bed the pads in properly when you first got the car? You've probably got excessive runout on the rotor causing the shudder. Get them machined.
i would have no idea how to bed the pads properly. so u saying i could of warped the new dics after maybe 3000km. and i dont feel anythin wrong but only under 20km ph? i have had warped discs before but i would had thought i would had felt it at any speed. and i never knew i could here the abs module atticvating, radio always on
no worries mate. i know its probably totally different to a push bike but i would be driving down a hill holding the brake on with the acclerator to get them nice and warm.
Donating Member
You might be right....the once only time mine came into operation, my eyes were glued on the taxi pulling out from the kerb on a wet road so I didn't really notice - but I remember reading somewhere that there was a visual signal as well but that could have been for another car or probably a figment of my imagination.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux
older models with abs generally dont have an abs light come on unless therre is a problem. correct me if im wrong
Cars cost too much.
^^ I think there's just a buzzer noise that comes on when activated..
The abs light should not come on when you brake hard enough to activate it, unless you have a fault in the system. I have seen this before at work you should be able to a emergency stop with no lights on the dash. Also it's a 6mm bolt to un bolt the front and rear wheel speed sensors. I have never seen a car where there not removable. To clean them just use a rag and a little brake cleaner or carby clean
From the description, I doubt it's the ABS. It's very obvious when the ABS is active.
My guess, from the description of the car and previous owner, is that the car has sat without being driven, especially if it has been washed and the discs left wet, that there has been some corrosion on the discs behind the pads. Another possibility is uneven transfer from the pad onto the disc becasue the car has been driven gently or the pads haven't been bedded.
It's probably not brake disc runout or disc thickness variation - yet - but will be if it's left unattended to.
There is a really good article written by Carroll Smith related to what I think is happening on the Stop Tech website.
I would try scuffing up the disc and pad surfaces with garnet paper (as per the article) before resorting to machining, although that may be required (read the article as to why).
so many options, recon i may take it to holden to get em to check em out. one department i think i shouldnt touch is the breaks, oil and plugs is enough at the moment, thanks guys
Has it been driving like that since you got it? I had my rotors machined and pads replaced but, after one relatively hard brake it went back to pulsating again. Luckily my mechanic was a top bloke and fixed them up again for free, but he said that on these kind of cars it only takes one hard brake to warp em
Mate Id wouldnt bother mucking about machining discs,once they are worn down or have been warped they are never the same as new discs,even if they have been machined,and these days brand new discs are that cheap,its just easier to replace them with new ones.I brake bloody hard in my car.I usually go through a set of quality pads in 6 -9 months,and Ive never have a problem with warped discs or a pulsating brake pedal.I replace the discs as soon as they are worn down to their minimum thickness..
na it didnt have the problem when i got it, i mostly do high way driving, dont live in the city so havent really been braked hard or used heaps
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