Surging brakes and vibration

[ITW]

Hi

My 2010 Pajero have some kind of trouble with the braked but I cant find out what.

If I'm driving slowly I can feel the brakes pumping like it's braking and than letting go a little than braking again, and I'm holding the pedal steady.
If I'm driving with more speed it vibrates and it feels like it's coming from the back of the car, but the whole car shakes when I'm breaking.
The more I break in speed the worse it gets.

I changed out the disks and pads in the back but no help.
I thought it could be some bushings but since its at slow speed is almost surging I don't think so.

Any ideas?

[Seigried]

Do you have all the brake clips and shims on your brake pads?

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[ITW]

I think so, I changed the pads my self, and did only put on what was there from before when I changed it, but the problem was there from before I changed it so could have been something missing already.

Any drawing on what should have been there I could look at?

[jjacer]

It's not your anti slip control activating is it? I currently have a big problem with my ASC which activates for no apparent reason. This all started after I had the battery replaced.
Perhaps turn off ASC by pressing the button left side lower dash below the steering wheel and see if it stops.
I have yet to find anyone who can reset mine for me, even Mitsubishi themselves couldn't do anything with it so now I have to switch off ASC everytime I drive - ridiculous situation.

[Peterng]

It's not your anti slip control activating is it? I currently have a big problem with my ASC which activates for no apparent reason. This all started after I had the battery replaced.
Perhaps turn off ASC by pressing the button left side lower dash below the steering wheel and see if it stops.
I have yet to find anyone who can reset mine for me, even Mitsubishi themselves couldn't do anything with it so now I have to switch off ASC everytime I drive - ridiculous situation.

I know this might seen strange..try another different brand of cranking battery and see what occurs..

[Stacho]

Hi. I’ve got the exact same problem. There’s another thread on this (can’t find it now) and one of the suggestions was uneven build up of glazing on the disc from gentle braking. One suggestion was to burn that off with some repeated 2/3 applications of heavy braking at higher speeds. I’m going to give it a shot this weekend actually.

[davwal]

Bizarre, I put this down to warped front discs, not sure now that you all seem to have this issue. Will be watching this.


Dave_W

[GHendo]

Hi. I’ve got the exact same problem. There’s another thread on this (can’t find it now) and one of the suggestions was uneven build up of glazing on the disc from gentle braking. One suggestion was to burn that off with some repeated 2/3 applications of heavy braking at higher speeds. I’m going to give it a shot this weekend actually.

You're probably talking about the thread I started ...

https://www2.pajeroclub.com.au/forum/showthread.php?t=65020

Geoff

[Stacho]

Correct! Thank you sir!

[spot01]

Unsure, but a couple of thoughts:
- have you flushed & bled the brake fluid?
- have you checked the wheel bearings?
- are the wheels & tyres in good condition & balanced recently, with even wear & same tyres all round?

[jjacer]

I know this might seen strange..try another different brand of cranking battery and see what occurs..

Thanks for the idea but mate I've had the exact same battery from RACQ 3 times previously with no dramas.
Mitsubishi started their usual " we'll start replacing everything in a process of elimination at your expense and you'll end up thousands out of pocket and still have the same issue you started with" but logically the issue started with the "technician" using some weird electronic box connected to the UBD2 port instead of the usual power supply plugged into the 12v lighter socket - seems to have caused a problem with the ECU.
Either way I'm stuck with trying to sort a very annoying and potentially dangerous issue due to a so called expert screwing up my Pajero doing something as simple as a battery change.

[spot01]

Thanks for the idea but mate I've had the exact same battery from RACQ 3 times previously with no dramas.
Mitsubishi started their usual " we'll start replacing everything in a process of elimination at your expense and you'll end up thousands out of pocket and still have the same issue you started with" but logically the issue started with the "technician" using some weird electronic box connected to the UBD2 port instead of the usual power supply plugged into the 12v lighter socket - seems to have caused a problem with the ECU.
Either way I'm stuck with trying to sort a very annoying and potentially dangerous issue due to a so called expert screwing up my Pajero doing something as simple as a battery change.

Simple things first:
Have you tried disconnecting the battery for 5 minutes, then re-connect? The front wheels MUST be straight ahead when doing this (or changing the battery).

[Peterng]

Surging brakes and vibration

The technician would have used a aux battery and connected your vehicle up to it whilst he was changing the battery..this is to limit vehicle aux systems from losing their settings...ie auto set radio stations and blue tooth settings..
As others have said..disconnect your battery completely..hold and touch the pos & neg leads together for a good 60sec..this resets the MAA factory settings for all the OEM electronic components..sort of a reboot..if you have aux items ie plug n play engine ecm mod..it might be best to disconnect it entirely.


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[BruceandBobbi]

The technician should would have used a aux battery and connected your vehicle up to it whilst he was changing the battery..

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Fixed it for you Peter.

[spot01]

The technician would have used a aux battery and connected your vehicle up to it whilst he was changing the battery..this is to limit vehicle aux systems from losing their settings...ie auto set radio stations and blue tooth settings..
As others have said..disconnect your battery completely..hold and touch the pos & neg leads together for a good 60sec..this resets the MAA factory settings for all the OEM electronic components..sort of a reboot..if you have aux items ie plug n play engine ecm mod..it might be best to disconnect it entirely.


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Radio stations, bluetooth, etc. have never been reset when I have removed the battery lead on my Gen 4 Pajeros. They use the jumper battery to preserve the ECU & auto trans settings, but in this case we want to reset the ECU.

Never heard of having to touch the leads together on a car to reset the ECU - never had to do this myself & would be wary of doing it with so much expensive electronics connected to it. I certainly wouldn't do it if the car has a second battery or other power source. I simply leave the negative lead off the battery for 5 minutes (as per the workshop manual for many cars).