Thread: Brake Pedal Pulsation

Hi Cameron, it has been a long time since I looked at a brake drum assembly but I seem to remember something about leading and trailing shoes in drum brakes, yours both look the same in the pic. Is it possible one of them is the wrong way around?
I am sure someone will be along soon with a bit more knowledge than me in this area.
Cheers,
Paul.

At its simplest - pulsating through the pedals is either warped disks and or drums out of round.

You said you have new drums on the rears so I would be having a look at the front disks however you said the rears are binding both with the new drums and old drums so I would then be taking the rear shoes back out and examining the new wear marks on them and any marks on the inside of the new drums and seeing if anything is obvious with fitting of the shoes and then carefully putting it all back and trying again.

Oh - as Harro mentioned have you got the shoes the right way around?

Garry

Unless someone can come up with a solution, I'd be looking to try and isolate the front from the rear somehow to confirm which end its from. Either blanking off the line to the rear diff or perhaps clamping the rear hose so the rears don't receive pressure (personally not a fan of clamping but when you're running out of options....).

If you've got the old rear brake hose see if you can blank that somehow and fit rather than putting vice-grips on your new hose

Steve

Hi Cameron, have a look at this.
Land Rover FAQ - 109 rear brakes

I don't know if it is the same setup as yours but may help.

Had another look at your pic and you may have both the leading on one side and both the trailing on the other?
As I said it has been a long time since I looked at Drums (and now I know why).

Cheers,
Paul.

Having the shoes the wrong way around shouldn't make for a pulsating pedal, just crap brakes.

For what its worth my One Ten has a slight pulsation that came about after fitting new drums and shoes this Feb or March. The pulsing is less than i've felt from an ABS equipped car so hoped it bedded in (and it has somewhat). Another club member has had an out of round drum too. It may be round but the mounting holes aren't concentric to the drum too. I guess it could also be that the hubs are out of concentric, and the previous drums were out enough in the opposite way to make up for it.
Is this the first time you have personally changed drums on this vehicle?

Originally Posted by isuzutoo-eh

Having the shoes the wrong way around shouldn't make for a pulsating pedal, just crap brakes.

For what its worth my One Ten has a slight pulsation that came about after fitting new drums and shoes this Feb or March. The pulsing is less than i've felt from an ABS equipped car so hoped it bedded in (and it has somewhat). Another club member has had an out of round drum too. It may be round but the mounting holes aren't concentric to the drum too. I guess it could also be that the hubs are out of concentric, and the previous drums were out enough in the opposite way to make up for it.
Is this the first time you have personally changed drums on this vehicle?

To check the mounting holes are concentric re-fit the drum in a different position (but leave out the drum retaining screws because you'll cover the tapped holes), the wheel will hold the drum in place.

Also clean up the face of the hub where the drum seats so its not sitting on rust/dirt and try. Are the tapped holes in the hub for the retaining screws raised at the edge causing the drum to not seat properly?

It'll be interesting to find out the answer to this one......



Colin

Thanks for your help.

Turns out I had the two leading shoes on one wheel and two trailing shoes on the other.

I changed them over but it has not completely fixed the issue.

There is still some pulsing through the pedal, nothing on what it was though.

I am hoping that with further adjustment as things start to wear, that it may solve it completely.

As an old mechanic who used to work for Better Brake many moons ago I thought I'd throw my two bob in.
In the picture you have what appears to be two leading shoes. Apparently you worked that out.
The pulsing can still be caused by a new drum. We used to lightly skim ALL new drums and discs before fitting.....sorry about that.