L322 Thumping when braking

micknkatenki · Jan 30, 2018

Evening all, 2006 L322, when braking there is a thumping noise in time with wheel rotation, first thought it was a sticking brake pad or caliper but all free and ok. If it were a brake drum on the rear you would think something was a miss inside but obviously this is only for the handbrake and not related to pressing the foot brake.

Any one have any ideas or simular experience as to what it could be, most google or forum searches brings up bushes but this is with wheel rotation not just a one off nock.

Thanks

myfirstl322 · Jan 30, 2018

Apart from the obvious answer of "warped discs", I was of the belief that the handbrake on the L322 facelift model still uses shoes inside the rear discs, and still cable operated, but only it now uses a motorised actuator to haul on the cables when using the E-brake thingmy, rather than a traditional handbrake lever.
I know the sport/disco3/4 has such a mechanism.
And they do go wrong, possibly failing partially applied?

(Yep, just re-read you saying only when using footbrake)

micknkatenki · Jan 30, 2018

Yes it does have handbrake shoes in drum center of the disc.
Disc and pads on the front are new, and rear pads cleaned and all free moving.
You can feel the thumping under the drivers side but guessing it's just transfer...

myfirstl322 · Jan 30, 2018

One problem with automatic vehicles is the discs 'picking up' pad material on a single part of the disc, this happens if the discs are very hot from a recent spirited braking from 60/70mph, then holding the car at some traffic lights whilst in D and holding on the footbrake. (which is the correct way, not P or N, anything longer than 30 secs you can switch to holding on the handbrake, still in D)

I would try a a couple of high speed emergency stops on a safe road (check your mirrors and drive 5 mins before the second go), this usually sorts that problem out, get that ABS kicking in!

gstuart · Jan 30, 2018

myfirstl322 said:
One problem with automatic vehicles is the discs 'picking up' pad material on a single part of the disc, this happens if the discs are very hot from a recent spirited braking from 60/70mph, then holding the car at some traffic lights whilst in D and holding on the footbrake. (which is the correct way, not P or N, anything longer than 30 secs you can switch to holding on the handbrake, still in D)

I would try a a couple of high speed emergency stops on a safe road (check your mirrors and drive 5 mins before the second go), this usually sorts that problem out, get that ABS kicking in!

hi

hope u don’t mind me asking , interested , ref , holding an auto in drive

always assumed to never ever hold an auto whilst stationary in drive over a few minutes but to put the handbrake on then into neutral

not being condescending or rude but just curious plse

thks again

myfirstl322 · Jan 30, 2018

@gstuart , From another forum, and not a technical explanation but I too heard it from a pro, and I've had mostly autos for the last 25 years and 10 cars, all with no ill effects on the transmissions, I also apply handbrake once parked, let it rest onto the slack before engaging P, but I worked that out myself!

_______________________________________________________________________
PaulV
172 posts

151 months
Monday 4th June 2012

My 2 pence worth of advice from my Dad.

Best to never use park instead of the handbrake (get it fixed), stick it in neutral, h/b on and let it take up the slack, then into park.

At lights, instead of foot brake, apply the h/b and then feet off the pedals. Modern boxes can cope with this and there is less internal wear than going into neutral and back.

My Dad used to mend Auto Boxes for a living, so I guess he should have some idea.

gstuart · Jan 31, 2018

myfirstl322 said:
@gstuart , From another forum, and not a technical explanation but I too heard it from a pro, and I've had mostly autos for the last 25 years and 10 cars, all with no ill effects on the transmissions, I also apply handbrake once parked, let it rest onto the slack before engaging P, but I worked that out myself!

_______________________________________________________________________
PaulV
172 posts

151 months
Monday 4th June 2012

My 2 pence worth of advice from my Dad.

Best to never use park instead of the handbrake (get it fixed), stick it in neutral, h/b on and let it take up the slack, then into park.

At lights, instead of foot brake, apply the h/b and then feet off the pedals. Modern boxes can cope with this and there is less internal wear than going into neutral and back.

My Dad used to mend Auto Boxes for a living, so I guess he should have some idea.

hi

many thks, it was just out of curiosity

only had autos for around 8 x years and always taken it out of drive, then into neutral if i’m stationery for more than a few minutes

thks again

micknkatenki · Feb 1, 2018

Update...... New discs and pads fitted to the rear problem all gone.

Job closed......

L322 Thumping when braking

micknkatenki

Active Member

myfirstl322

Well-Known Member

micknkatenki

Active Member

myfirstl322

Well-Known Member

gstuart

D3 Grandad

myfirstl322

Well-Known Member

gstuart

D3 Grandad

micknkatenki

Active Member

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