power assisted brake??? HELP

[m-chan68]

Originally Posted by bigcountrysg

The Vaccum Pump has nothing to do with the brake system on our trucks. The power booster for the power brakes receives hydraulic pressure from the powersteering pump.


Another thing it could be though is the ABS control.

The OP did specify an E-350, which DOES use a vacuum type booster fed by an engine driven vacuum pump, unlike F-Series trucks or E-450.

[High Mileage Jim]

The vacuum pump is bad. I've replaced 4 of them over the past 5 years. Can only get about 150,000 miles out of one.

[elibenson]

Originally Posted by m-chan68

Yes, I would 2nd that. I believe the OP specifically mentioned an E-350 which DOES use a vacuum type brake booster (as opposed to a hydroboost style assist on F-Series and E-450 trucks), that gets its vacuum from an engine driven pump. This is also very consistent with the loud noise heard from the driver side of the engine compartment where the vacuum pump is situated. I know I have replaced more than my fair share of these, on these vans.

^^^what he said..

I know for sure that all the 7.3l vans had vacuum boosted brakes. Although I do have an E450 (2004 6.0l) with hydraboost. I don't know if it was an option on the E450, or what, but I have heard that some other 6.0l vans don't have hydraboost. For the longest time I thought they did away with vacuum brakes when they switched to 6.0l.

Those vacuum pumps don't last too long. I have replaced 5 in the past year. 2 on the same truck.