1990 90 Rear wheels locking under normal pressure

Evening

The weels on my 1990 90 lock up now under normal braking - they never used
to....

What can i check? The shoes look quite new, and the adjuster is in as far as
it will go.

Where do i start?

Mark
9090

Mark Solesbury wrote:
> Evening
>
> The weels on my 1990 90 lock up now under normal braking - they never used
> to....
>
> What can i check? The shoes look quite new, and the adjuster is in as far as
> it will go.
>
> Where do i start?

With the basics - check that they shoes are actually adjusted correctly,
check for siezed wheel cylinders, and contamination of the lining
material (with oil and/or brake fluid). After that check for
inefficient front braking (ie siezed calipers). If everything appears to
be working correctly then you could chamfer the leading edges of the shoes.

I'll wager a beer on the fact you've got a partially siezed wheel
cylinder though. ;-)

--
EMB

"EMB" <[email protected]> wrote in message
news:[email protected]...
> Mark Solesbury wrote:
> > Evening
> >
> > The weels on my 1990 90 lock up now under normal braking - they never
used
> > to....
> >
> > What can i check? The shoes look quite new, and the adjuster is in as
far as
> > it will go.
> >
> > Where do i start?
>
> With the basics - check that they shoes are actually adjusted correctly,
> check for siezed wheel cylinders, and contamination of the lining
> material (with oil and/or brake fluid). After that check for
> inefficient front braking (ie siezed calipers). If everything appears to
> be working correctly then you could chamfer the leading edges of the
shoes.
>
> I'll wager a beer on the fact you've got a partially siezed wheel
> cylinder though. ;-)
>
> --
> EMB



I dont think its a siezed calper on the front, as it stop well and does not
pull. Plus the pads are evenly wearing.

Ive checked that the pistons on the rear all move OK, and that the shoes and
drums on the back are clean.

I read about a Rear Pressure valve? Could this be Fubar?

Mark
9090

In message <[email protected]>
"Mark Solesbury" <[email protected]> wrote:

>
> "EMB" <[email protected]> wrote in message
> news:[email protected]...
> > Mark Solesbury wrote:
> > > Evening
> > >
> > > The weels on my 1990 90 lock up now under normal braking - they never
> used
> > > to....
> > >
> > > What can i check? The shoes look quite new, and the adjuster is in as
> far as
> > > it will go.
> > >
> > > Where do i start?
> >
> > With the basics - check that they shoes are actually adjusted correctly,
> > check for siezed wheel cylinders, and contamination of the lining
> > material (with oil and/or brake fluid). After that check for
> > inefficient front braking (ie siezed calipers). If everything appears to
> > be working correctly then you could chamfer the leading edges of the
> shoes.
> >
> > I'll wager a beer on the fact you've got a partially siezed wheel
> > cylinder though. ;-)
> >
> > --
> > EMB
>
>
>
> I dont think its a siezed calper on the front, as it stop well and does not
> pull. Plus the pads are evenly wearing.
>
> Ive checked that the pistons on the rear all move OK, and that the shoes and
> drums on the back are clean.
>
> I read about a Rear Pressure valve? Could this be Fubar?
>
> Mark
> 9090
>
>

If you can rule out everything else, then the compensator is a definate
possibility, but it's also definately the last thing to consider.

Richard
--
www.beamends-lrspares.co.uk [email protected]
Running a business in a Microsoft free environment - it can be done
Powered by Risc-OS - you won't get a virus from us!!
Boycott the Yorkshire Dales - No Play, No Pay

"Mark Solesbury" <[email protected]> wrote in message
news:[email protected]...
> Evening
>
> The weels on my 1990 90 lock up now under normal braking - they never used
> to....
>
> What can i check? The shoes look quite new, and the adjuster is in as far
as
> it will go.
>
> Where do i start?
>
> Mark
> 9090
>
>


Had another look this morning - The front pads are lowish, I can see about
1cm of each pison. Could it be that the fronts are too low?

I'm going to change the pads tonight to see if it makes any difference.

mark
9090

On or around Wed, 08 Feb 2006 08:36:03 +1300, EMB <[email protected]>
enlightened us thusly:

>Mark Solesbury wrote:
>> Evening
>>
>> The weels on my 1990 90 lock up now under normal braking - they never used
>> to....
>>
>> What can i check? The shoes look quite new, and the adjuster is in as far as
>> it will go.
>>
>> Where do i start?
>
>With the basics - check that they shoes are actually adjusted correctly,
>check for siezed wheel cylinders, and contamination of the lining
>material (with oil and/or brake fluid). After that check for
>inefficient front braking (ie siezed calipers). If everything appears to
>be working correctly then you could chamfer the leading edges of the shoes.
>
>I'll wager a beer on the fact you've got a partially siezed wheel
>cylinder though. ;-)

The brakes on the back of the minibus do this on damp mornings until you've
used them a bit and warmed 'em up. I suspect some kind of contamination of
the brake shoes, but they want an arm and a leg for new ones. There's
nothing wrong with 'em mechanically, AFAICS. When I first got it it did
this all the time, which was due to an improperly adjusted load compensation
valve on the back axle. There's a chart to translate unladen rear axle
weight to a setting dimension - it was set considerably off the end of the
chart! Adjusting it slightly more sensibly made it much less prone to skid
embarrassingly every time you came up to a junction.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"The breezy call of incense-breathing Morn, The swallow twittering
from the strawbuilt shed, The cock's shrill clarion, or the echoing
horn, No more shall rouse them from their lowly bed."
Thomas Gray, Elegy Written in a Country Churchyard.

I know it's a pain but you could always fit a classic Range Rover rear axle
then you have disc brakes all round...

Regards

Brian Tonks
Tonks4x4
27-29 Main Street
Huthwaite
Sutton-In-Ashfield
Nottinghamshire
NG17 2LD
01623 452885

http://www.tonks4x4.com




"Mark Solesbury" <[email protected]> wrote in message
news:[email protected]...
>
> "Mark Solesbury" <[email protected]> wrote in message
> news:[email protected]...
> > Evening
> >
> > The weels on my 1990 90 lock up now under normal braking - they never
used
> > to....
> >
> > What can i check? The shoes look quite new, and the adjuster is in as
far
> as
> > it will go.
> >
> > Where do i start?
> >
> > Mark
> > 9090
> >
> >
>
>
> Had another look this morning - The front pads are lowish, I can see about
> 1cm of each pison. Could it be that the fronts are too low?
>
> I'm going to change the pads tonight to see if it makes any difference.
>
> mark
> 9090
>
>
>

Brian Tonks <[email protected]> uttered summat worrerz funny about:
> I know it's a pain but you could always fit a classic Range Rover
> rear axle then you have disc brakes all round...
>
> Regards
>
> Brian Tonks
> Tonks4x4
> 27-29 Main Street
> Huthwaite
> Sutton-In-Ashfield
> Nottinghamshire
> NG17 2LD
> 01623 452885
>
> http://www.tonks4x4.com
>

I'd sort the front first, poor braking efficiency on the front may be
masking the problem , the rears could be fine, doing their job. As you get
used to the poorness it just feels "normal". I'd guess once the front pads
are replaced you should wear a hard hat and chin guard for the first couple
of brake applications ;-)

Lee

Whats involved in fitting a disc braked rear axle to a 90 ?

Richard




"Brian Tonks" <[email protected]> wrote in message
news:[email protected]...
>I know it's a pain but you could always fit a classic Range Rover rear axle
> then you have disc brakes all round...
>
> Regards
>
> Brian Tonks
> Tonks4x4
> 27-29 Main Street
> Huthwaite
> Sutton-In-Ashfield
> Nottinghamshire
> NG17 2LD
> 01623 452885
>
> http://www.tonks4x4.com
>
>
>
>
> "Mark Solesbury" <[email protected]> wrote in message
> news:[email protected]...
>>
>> "Mark Solesbury" <[email protected]> wrote in message
>> news:[email protected]...
>> > Evening
>> >
>> > The weels on my 1990 90 lock up now under normal braking - they never
> used
>> > to....
>> >
>> > What can i check? The shoes look quite new, and the adjuster is in as
> far
>> as
>> > it will go.
>> >
>> > Where do i start?
>> >
>> > Mark
>> > 9090
>> >
>> >
>>
>>
>> Had another look this morning - The front pads are lowish, I can see
>> about
>> 1cm of each pison. Could it be that the fronts are too low?
>>
>> I'm going to change the pads tonight to see if it makes any difference.
>>
>> mark
>> 9090
>>
>>
>>
>
>

On Thu, 09 Feb 2006 14:59:49 GMT, "Richard"
<[email protected]> scribbled the following nonsense:

>Whats involved in fitting a disc braked rear axle to a 90 ?
>
>Richard
>
>
Disconnect rear prop.
Disconnect flexible brake line and plug to prevent fluid loss
Disconnect axle breather
Disconnect any wiring for pad sensors
Disconnect a frame balljoint from axle
Remove dampers from vehicle
Remove springs
Remove trailing arm to axle bolts
Lift rear of vehicle and roll axle backwards from under it.

Refitting is a reversal of the above ;-)

Did this last year to a friends Disco which for some reason had been
fitted with a drum back axle.......

Found that fitting a set of 6.00x16 tyres and rims and letting nearly
all the air out made removal simpler as you can still roll the axle
around easily and away from under the body. With no wheels they are
bloody awful things to move!
--

Simon Isaacs

Peterborough 4x4 Club Newsletter Editor and Webmaster
Green Lane Association (GLASS) Financial Director
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