Thread: So, 101 drum brakes DO work!!

Here is the other one that goes with it. Also part of the test report.

That is Misguided 2 currently owned by a AULRO member. The vehicle was one of the two Brit trials vehicles brought out from the UK for the Aust army to test. The pics are of the brake tests - there was never an issue of the brakes actually working just how haphazard they were.

When the 101s were purchased by the Aust Army the two trials vehicles remain here and integrated into Aust service even though they were a slightly older version with things like series 2 door locks vs the later series 3 anti-burst door locks.

Also at the time they may still have had a 1 tonne load rating rather than our 1.5 tonne load rating but not sure on this.

Garry

That's great! Didn't realise it was taken in Australia. I like the write up about the brake pro portioning valve.... If the back wheels are off the ground, it does not matter what you do with the valve!!

Originally Posted by Sitec

That's great! Didn't realise it was taken in Australia. I like the write up about the brake pro portioning valve.... If the back wheels are off the ground, it does not matter what you do with the valve!!

Of course it is the main reason the rear wheels are off the road. I have tested this myself with the proportioning valve out of the vehicle - when unloaded the rear brakes on a properly set up 101 do not work as the valve shuts off brake fluid to the rear so all braking effort is via the front wheels so the rears can lift. With load, the rear settles on the suspension and cracks open the valve allowing fluid to the raer and braking is more balanced.

As I said the 101 valve is closed in unloaded position where a Landcruiser valve which is very similar is slightly open in the unloaded position - I have modified a landcruiser valve and have it installed on the 101 activating levers so I have some rear brakes when unloaded.

Garr

Where's the driver? Firmly planted back into the seat in anticipation or already through the screen?

So does that mean in reverse with no load you only have front brakes?
Bit scary

Originally Posted by 123rover50

So does that mean in reverse with no load you only have front brakes?
Bit scary

No, because if you braked while travelling backwards, there would be weight transfer to the back wheels, so the valve would open.

Thanks. I get it now. No experience with these valve things. My 109 FC doesnt have them, I thought they were a Jap thing.

Originally Posted by vnx205

No, because if you braked while travelling backwards, there would be weight transfer to the back wheels, so the valve would open.

I can assure you there is no weight transfer if unloaded and you hit the brakes hard going backwards...............the back springs rarely move unloaded as a pair.
Most proporsioning valves dont work these days on 101s and its any bodies guess at what position it is stuck on.
The valve is hard to repair and the pivot for the arm that operates it tends to wear.
If you can bleed the rear brakes you must be getting some sort of effect from the back brakes.
I have never found a issuse rolling backwards on a steep hill , but overseas they have ?????
The funny part about it is the parking brake is so good I can use my little finger and apply the parking brake and hold the 101 on any hill.

I do know like most other 101 drivers going forwards under normal conditions the front brakes do most of the work and the front brake shoes wear fast , while the rear shoes hardly wear at all.
The front shoes are self energising in a forward direction on both shoes.
On the rear brakes only one shoe per side is self energising in each direction.