curious ABS pump activity

[onebob]

My D2 is not my daily driver and only gets taken out once a month or so for camping or day trips. I've noticed this year when braking and bring the D2 to a stop such as at traffic lights or parking the ABS pump can be heard activating briefly. It'll do it 2 out of 5 stops.

Over a year ago I had installed braided brakelines in the hope that it would firm up my pedal (it did marginally) and at the time did the 1 man bleed trick by remotely activating the ABS pump to push the fluid through, brake fluid level is always good and doesn't ever need top ups, and i get no fault warning lights just that brief little buzz sound as you pull up and stop. Tyre pressures "look" all okay but I'll dash out and check when i post this.

checked the tyre pressures and they're all identical

Any ideas anyone....?

PS: I plan to do a pressure bleed and have assembled a diy pressure canister and are working out a solution to cap and pressure seal the brake fluid reservoir.

onebob

[kelvo]

Have you ever had any of the hubs replaced?

Some aftermarket hubs are known to have the incorrect number of slots causing TC and ABS issues.

[onebob]

Have you ever had any of the hubs replaced?

Some aftermarket hubs are known to have the incorrect number of slots causing TC and ABS issues.

Thanks for your input kelvo, they're all original hubs. I plan to do a pressure bleed then do the HDC trick to thoroughly bleed the ABS unit then pressure bleed again and see where that gets us to..

onebob

[697-Nodad]

Are you sure its the ABS pump?

Could it be the ACE activating? - I had an ACE fault that would usually come up under braking.

Air bag pump?

Also, I dont see how tyre pressure could cause a problem, a flat tyre would still have the same rolling diamater.


Cheers

[onebob]

Are you sure its the ABS pump?

Could it be the ACE activating? - I had an ACE fault that would usually come up under braking.

Air bag pump?

Also, I dont see how tyre pressure could cause a problem, a flat tyre would still have the same rolling diamater.


Cheers

Ah! you could be right about ACE, and i have no air supension.

I gotta say I'm really not certain about wheel speeds differing at different inflation pressures - however re your last point about rolling diameter of flat vs fully inflated tyres, perhaps you meant to say circumference..;)

[ballbag]

V8? There seems to be a servo in the air con unit that activates when mine comes to a stop, assuming it's activated by manifold vacuum.

[697-Nodad]

Ah! you could be right about ACE, and i have no air supension.

I gotta say I'm really not certain about wheel speeds differing at different inflation pressures - however re your last point about rolling diameter of flat vs fully inflated tyres, perhaps you meant to say circumference..;)


Yep :) I'll eat some humble pi on that

[onebob]

My D2 is not my daily driver and only gets taken out once a month or so for camping or day trips. I've noticed this year when braking and bring the D2 to a stop such as at traffic lights or parking the ABS pump can be heard activating briefly. It'll do it 2 out of 5 stops.

Over a year ago I had installed braided brakelines in the hope that it would firm up my pedal (it did marginally) and at the time did the 1 man bleed trick by remotely activating the ABS pump to push the fluid through, brake fluid level is always good and doesn't ever need top ups, and i get no fault warning lights just that brief little buzz sound as you pull up and stop. Tyre pressures "look" all okay but I'll dash out and check when i post this.

checked the tyre pressures and they're all identical

Any ideas anyone....?

PS: I plan to do a pressure bleed and have assembled a diy pressure canister and are working out a solution to cap and pressure seal the brake fluid reservoir.

onebob

:oops2::oops2: who's feeling like a goose.......it seems that little buzz sound is the centrifugal filter spinning down:angel:

[Pedro_The_Swift]

at least you know its working!:p

[PhilipA]

Swap you , your ears for mine.LOL
What do you say? what ?
Regards Philip A

[discorevy]

Just a quick note on the rotor filters , if you can hear them buzzing, its more than likely a lower quality brand , the central hole on them isn't exactly central , next time you go to replace one , give it a spin in the housing, you'll see it if it's out of round

[onebob]

Just a quick note on the rotor filters , if you can hear them buzzing, its more than likely a lower quality brand , the central hole on them isn't exactly central , next time you go to replace one , give it a spin in the housing, you'll see it if it's out of round

Hmmmmm! mine's a REPCO branded filter...

[discorevy]

Repco are normally pretty reasonable , but I guess it comes down to who makes those particular filters for them , the only other thing that could cause it would be a bent shaft, yet to see one though.

[schuy1]

Had a pack of 6 of the blue box rotors and 3 of the 6 were quite badly unbalanced, such that the wobble was plainly seen by hand spinning. 1 of the others had a slight whir while running down. Having said that I also had a genuine 1 that made noise also.