AE111 Brake problem

[FANGIN]

Aite, so according to the WOF man, my rear brakes are un balanced.

According to the brake machine this is how they stack up:
Fronts read an equal 150ish (NORMAL)
Rear left reads 120ish (NORMAL)
Rear right reads 190ish (Way too much braking force)

Handbrake reads equal.

After having a chat with the guy, it seems that the rear right has way too much force on it when the foot brake is applied.

What could cause this?

Only have till Saturday to get this sorted, otherwise I have to cough up for another check.

Of course the dodgy way would be to let some air into the system and have a spongy pedal.

[Mr Revhead]

Dodgy proportioning valve?

[FANGIN]

Have been told they dont have one.
Yet to check under the car to verify this.

[Mr Revhead]

Yes it does
http://www.toyodiy.com/parts/p_J_199511 ... _4708.html

On the firewall

[FANGIN]

Is this a left / right or front / rear proportioning valve?

[xsspeed]

Should clarify what I told you mike, they have a proportioning valve but it is not adjustable iirc

[Mr Revhead]

I think they are one front, one rear...
Tracing the brake lines might tell you.
Yeah not adjustable, but Maybe cleanable, but remember it's brakes, if you don't know what you are doing...

[FANGIN]

Thanks for the info Revhead. Replacing the unit can't hurt.

[RobertC]

I got a warning for the same thing as you a few wof's ago. But next warrent I got I had fixed its self.

But a couple of maonth ago when I changed the rear pads I noticed the right rear caliper was siized. (the locating pin not the piston its self) Maybe the problems could be related?

[FANGIN]

The thing is, the rear left is reading fine, from what the wof guy told me, the readings were on par for "this type of vehicle".

Hell, should just let a little air into the line, wouldn't fix the problem but would make the pressure drop.

Should mention that this is a NON-ABS system.

[Mr Revhead]

hmmmm ^ dumb idea imo

the braking circut is usually split diagonally.

[FANGIN]

Yes it is a dumb idea, sarcasm is hard to portray in text form.

Braking system is split diagonally? Elaborate please?

[Mr Revhead]

yes it is.

eg, l/h front and r/h rear on one circuit
r/h front and l/h rear on the other.
with the prop valve splitting amoungst those.

My point being the rear brakes are on a different circuit so quite easy for them to read different if there is something wrong with one of them.

[FANGIN]

I'll investigate tonight.

[Bling]

Have had this enough times to make me go mad Most of the time in AE111's too. Though I suspect the wof brake rollers....

Last time I just pulled the pads and sanded the pads / discs like f**k, pretty sure it did the trick Easy / free way to try get it through the wof.

[FANGIN]

Have had this enough times to make me go mad Most of the time in AE111's too. Though I suspect the wof brake rollers....

Won't be the rollers, they measured the fronts & the handbrake fine...

Whats the point in sanding the brakes? less friction on the disk?

[rollaholic]

have ya actually pulled it apart to see if everything is moving normally etc? on both sides?

[FANGIN]

Yup, have pulled both rear calipers off and both are working fine

[Bling]

Have had this enough times to make me go mad Most of the time in AE111's too. Though I suspect the wof brake rollers....

Won't be the rollers, they measured the fronts & the handbrake fine...

Whats the point in sanding the brakes? less friction on the disk?

Going back a bit now since I did it, but I think the pads were a bit glazed / probably just a placebo deal but it passed 2nd time so who knows.

[spencer]

Yup, have pulled both rear calipers off and both are working fine

popped the piston out and all?