Brake Problems In The Man Wagon.

[Weaselman]

Hey guys.

Got a problem with the wifes 260RS.

No ABS light and pads and rotors are fine but aside from a good initial bite I have no real brake power and a hard pedal. Also no ABS at all by the feel of things.

I have a Vacuum tank in the engine bay and have tested with and without it and the problem remains. Engine makes good vacuum too.

I don't have a scanner but I suspect the pump on the ABS assembly has shit itself. I've bled the system with the ignition on too and didn't get any air out of it. Checked the fuses for a circuit and I have also cleaned and inspected the wheel sensors all round.

Any help would be appreciated. I've got to try and fix it myself because the mechanics in my town are f**king idiots and seem to f**k more than they fix.

98 Nissan Stagea 260RS with RB26dett. Stock set up all round aside from wheels, springs and exhaust.

[Duncan]

Assuming the pedal is like a block of unresponsive wood, vacuum booster issue would be the most obvious. not sure exactly what you have checked from the post above...I'd check for

Split in the line from the plenum to the one way valve to the vaucuum cannister to the booster under the master cylinder.

Check the one way valve works properly (blow through should work one way but not the other)

Possibly failed booster (although they are generally reliable)

Easy to check the booster because the pedal will feel totally different when the car is stationary with engine off vs engine idling

Alternatively it could be horrible pads, cracked brake pedal bracket. But they shouldnt feel *that* bad

ABS seems unlikely, the most common failure is a leak and while there are lots of interesting internals I can't see how a hard pedal would be a result