JST Posted October 5, 2006 Share Posted October 5, 2006 '84 90 truck cab with rangie disk rear axle. new pads new braided flexible pipes new mastercylinder new vacuum servo new pad pins Its not a loose wheel bearing. background: brakes work extremely well for intial depressions of the pedal, assistance appears lost with repeated braking. on repeated pressing of the brake pedal either moving or stationary the pedal goes hard on about the 4th pump of the pedal and its akin to loosing the power assistance. Checked and changed: Brake vaccum pump produces a good suction on the end of the hose to vacumm servo (enough to make finger go red - is this enough?) Not brake fade as it happens when stationary. Various parts changed as above over time as above. any thoughts? does the m/c plunger length need changing or brake vacuum pump not creating a big enough vacuum - and how would you check it? thanks in advance for your thoughts. Quote Link to comment Share on other sites More sharing options...
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