Brake Power Regulator

[Agon]

Hello all , does anyone know if Octavia 2003  130PD have a brake power regulator ?

 

My brakes are very soft sometimes , sometimes they are good but if just slight brake applied in a turn the rear goes out of control , i think there is too much power in rear brakes

 

I read that this may be one of the problems , if anyone have any info or its location

 

 

Thank You

[cheshire_cat]

not crap tyres is it?

[Agon]

i had much worse tyres before and didnt slip that way , tyres in  good shape for the moment but before when i brake you could feel the brake power in front your whole body would go foward now its just like 50-50 , suspension is old too that why i asked maybe that is misleading the brake power regulator (if exist) because it has to do something with weight distribution i think

[octyal]

If you don't have ABS then there will be a load sensing valve, usually attached to the rear axle and the body. This adjusts the brake pressure to the rear axle depending on the amount of weight in the back. If you have ABS, then that function is usually controlled via the abs system. It is possible for them to seize up, especially if they don't carry much weight in the back (although the normal suspension movement should be satisfactory to keep them operating - bear in mind that they are in a very harsh environment). Certainly worth getting underneath and spraying it with penetrating fluid (plus gas or similar - not a dispersant like WD40) then jumping up and down in the back to try and free it off - if that doesn't work then you will need a new one.

Escort vans used to suffer terribly with the same thing......

[Agon]

It has ABS , but i notice difference when car is heavier in back the brake gets more spongy and doesnt use the force in front when car unloaded then its better :/ are the chances that this regulator may be fitted in abs cars too ?

[Tech1e]

PD130 will have ABS so no load sensing valve.

When did it last have a brake fluid change? What condition are the rear beam bushes in?

Edited 22 June, 2016 by Tech1e

[Agon]

PD130 will have ABS so no load sensing valve.

When did it last have a brake fluid change? What condition are the rear beam bushes in?

Last fluid change was 2-3 months ago , in a authorized vw dealer with pressure pump , brakes got a bit better after but sometimes they go soft sometimes not , vacuum system checked its ok , maybe a air bubble traped somewhere ?

Didnt check the bushes is there a way to check or should be removed ?

Edited 22 June, 2016 by Agon

[Tech1e]

Have the pads been changed/inspected?

Sometimes the surface of the pad can deteriorate giving a soft pedal. Ultimately though a soft pedal with excessive travel will be one of the following

Air in the system

Faulty master cylinder

Faulty servo (although unlikely).

[Agon]

pads are almost 1 year old  in close inspection i think rear  discs are not in a good shape , what do you think

Edited 22 June, 2016 by Agon

[Tech1e]

Not horrendously bad.