Lifetime Supporting Member
Join Date: Jun 1999
Location: College Station, TX
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Re: Brake Problem - Vacuum pump - how to test?
I haven't gotten around to researching further but when my last vacuum pump went out there were metal shavings all around the pump and on the hose. Since replacing I have an occassional hissing on first start up that goes away after hitting the brakes. My climate control also acts up when going from vent/heat/defrost/ac etc. Both problems began immediately after the failure. I'm wondering if I got metal shavings in the vacuum hoses somehow. Just a theory and maybe a very poor one but figured I'd toss it out.
'94 F350 4x4 PowerStroke, 5-speed, 4.10 gears, crew cab, XLT, Luk Clutch, ZF-47, Hydroboost, AIC, Max A/C Assist, 95.5 radiator and degas bottle 318,000 miles
'96 F350 4x4 PowerStroke, auto, 4.10 gears, crew cab, XLT, DRW conversion, AIC, 502,000 miles
'02 F350 4x4 PowerStroke, 6-speed, 3.73 gears, crew cab, XLT, DRW, AIC, 223,000 miles