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Brakes work but pedal sinks if I apply constant pressure
The brakes seem to work fine stopping the truck, but if I'm idling at a red light and put steady pressure on the brake pedal, the pedal will slowly sink pretty much down to the floor.
I did the booster test and got a good hiss when removing the vacuum hose after the truck has been off for a few minutes. So I guess the booster is ok.
Advice please. Thanks.
'95 1500 W/T, 4.3 liter v6, 200k miles
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