How to repair a Faulty ABS / HBB Motor Pump on a Pajero / Montero / Shogun

[Mark299]

Hi Rykiel 575
So when you say you replaced the HBB was that the motor and the accumulator? The whole unit?
From my understanding it has 3 main components. The motor, that sits under the reservoir that holds the brake fluid and the connections and the accumulator that is the cylindrical container that sits next to the fluid reservoir.

If anyone can clarify this let me know. Thanks again

[rykiel575]

Whole unit with one bought 2nd hand from another member on here. My plan was to then rebuild the hbb motor but I ended up selling the Pajero.

[Mark299]

Thanks for the reply
So did you sell the old one with the Pajero?

Anyone else who can assist?

Thanks

Mark

[Having Fun]

We had the chirp (2006 3.8 NP) & changing the accumulator fixed it. Haven't heard it since & have had no other brake issues.


Good luck with it!

[Mark299]

Hi Having Fun
Yes I had a play to day and I can feel the motor kick in (runs very smooth)and there is no noise, then the accumulator shudders and the chirps come in. I have found one brand new genuine locally for $300 (Mitsubishi wanted $546.50) so I am picking it up next week.

Thanks everyone for your feedback and assistance.

[rykiel575]

You might as well take the HBB out and have a look at the motor commutator condition, and then do a full flush of brake fluid.,

[Having Fun]

Said with all due respect, but why pull out the HBB?

He's already bought an accumulator. Why not wait to see if that fixes the problem. Then, if it does, why not leave well enough alone?

I agree with the brake fluid flush though & would add to that, our ABS ECU was re-set after the accumulator was fitted too

[rykiel575]

As a precaution to have a look at the condition of the commutator segments on the armature.

If the accumulator is already having problems then the motor might not be too far behind.

Besides it's not too hard to pull the HBB unit out. Might as well have the unit out to easier access the accumulator.

[janus]

UPDATE: I've since found out that you can purchase the lower motor assembly from Mitsubishi. Part number MN102843 (shown as 54242 in their diagrams, I will make a new post in this thread). Price in WA on 2/7/15 was AUD917.40

So, how to repair the motor. You can't purchase the motor seperately. Oh no, that would be way too easy and cheap.

Hi, I have a doubt, I finally don't know if the motor of the HBB can be purchased separately or not in the Mitsubishi dealer. I am confused if it's the part MN102843 or not.


If someone can clarify me about it I will be very grateful.


Best regards.

[rykiel575]

Best to contact mitsubishi or check your VIN against a parts catalogue.

Your NT seems to have a 4m40 engine?

[janus]

Your NT seems to have a 4m40 engine?

Right, I'm from Costa Rica, the Mitsubishi dealer sells the Pajero with the Montero name, and here you can still find new NX models with the 4M40 engine, they are very popular here, more than 4M41.


My brakes are fine, I was just curious.


Here's a pic of the 4M40 in an NX.


Best regards.

[Coopz]

Just finished doing this repair

Some helpful advice, the original rewinders listed here are no longer in business, I purchased my motor off Ebay
They I am told are new motors however this one had a fault out of the box which was a winding not soldered correctly I fixed it myself

[benckj]

Hard to see but take it the solder connection was on the brush?
What is that large blob of puddy on top of winding?

[Coopz]

It was a wire connecting onto the commutator, the "putty" he tells me is to balance the motor, not so happy having that lump in two places spinning inside the motor, I have to say I do get a weird vibration through the brake pedal when the motor is running but the system is working fine, I make pull it all out again to remove the putty

[benckj]

Very strange.
The vibration may be air in system. Mine did that until I bled again and stomped on brakes hard when on soft ground to make ABS work. Might be worth a try.