Need some ideas about 110 brakes please.
The effort required to stop is like there's no servo. It's ok but I couldn't lock the wheels so I'd rather not ignore it. Here's what I do know;
Pads are nearly new all round
Problem has developed progressively rather than suddenly
The servo is getting vacuum from the air pump but barely measures on a vac guage. Does anyone know what kind of vac reading might be reasonable at idle / when revved ? It's definately a lot less than a conventional manifold vac on a petrol engine.
Revving the engine produces more vac but not huge amounts.
When I start the engine with the brake pedal pressed it stays in the same position - ie doesn't drop a bit as you might expect.
The non-return valve to servo works correctly.
The car doesn't have a front/ rear pressure proportioning valve.
So - any ideas on where to look next or is it just a weak vac pump ?
The effort required to stop is like there's no servo. It's ok but I couldn't lock the wheels so I'd rather not ignore it. Here's what I do know;
Pads are nearly new all round
Problem has developed progressively rather than suddenly
The servo is getting vacuum from the air pump but barely measures on a vac guage. Does anyone know what kind of vac reading might be reasonable at idle / when revved ? It's definately a lot less than a conventional manifold vac on a petrol engine.
Revving the engine produces more vac but not huge amounts.
When I start the engine with the brake pedal pressed it stays in the same position - ie doesn't drop a bit as you might expect.
The non-return valve to servo works correctly.
The car doesn't have a front/ rear pressure proportioning valve.
So - any ideas on where to look next or is it just a weak vac pump ?