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Old 12-21-2011, 09:48 PM
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Brake Vacuum Pulley? HELP

Well, managed the blow up my serpentine belt on the way home from work tonight. Limped the truck home (about 5 miles) without brakes or power steering. Kept a close eye on the engine temp, and luckily it was cold outside as I didn't even come close to overheating. Popped the hood and got the belt untangled from the radiator fan and water-pump. No damage there.
Upon furthe inspection I realized the upper idler pulley (between AC and power steering) was bent so badly that it was wedged against the engine block and unable to turn.
What am I looking at as far as repairs? I'm relatively new to the PSD, so I'm unsure whether I just shot a bearing, or if it's possible the shaft that the pulley rides on itself is bent. I'll post pictures in the AM, and will probably know more once I've removed the pulley. I don't feel like working on the truck without good lighting in 20degree weather.

Last edited by backwoodsboy; 12-22-2011 at 11:24 AM.
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Old 12-22-2011, 11:27 AM
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Turns out my assumption last night was wrong. After looking at the belt diagram closer, it seems that I've actually shot a bearing, or bent the shaft on my brake vacuum pump.
The pulley itself is smooth, not ribbed, which led me to believe it was an idler pulley.
Any advice? Am I looking at a new vacuum pump ($$) or can i replace the pulley itself?
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Old 12-22-2011, 11:40 AM
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New pump, its only 3 10 mm bolts holding it in, mine seized a while ago, pretty easy fix actually.
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Old 12-22-2011, 11:52 AM
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i had that issue, turned out the bearings in the idler pulley were shot. replaced that and i was good to go. nothing went wrong with the vacuum pump though...
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Old 12-22-2011, 12:03 PM
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Any need to bleed the brake system afterwards? I noticed some brake fluid on the cap of my master cylinder, but that's probably the result of me standing on the brake with both feet approaching a red light.
Talk about a 'full body workout'. P90X has nothing on driving a fullsized truck without power steering or brakes.
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Old 12-22-2011, 12:30 PM
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Lmao, damn straight, yeah when my vacuum pump went out I got 2 belts, both with warranty, and snapped one before I even got it home, guy at the parts counter thought I was crazy kause belt cost $100 and he said they were guaranteed against ripping like that, guess he don't know much bout diesels lol, but gave me a refund and I installed other belt and got a new pump never had problem since
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Old 12-22-2011, 06:38 PM
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Well, six hours, two trips to the hardware store, and a trip to my parts store later and I finally have a new vacuum pump on the truck.
Whoever the jack@SS was who put the previous pump on must have had the entire front clip off, and used a foot long cheater bar. I'm a pretty strong guy (bench over 350lbs) and those 10mm bolts wouldn't move for the longest time.
Turns out I shot the rear (aluminum) pressure seal completely off the pump, and my pulley rubbed a decent sized groove into the pump itself. I'd say it was time for a new one . I'm going to wait for morning to install the new belt, and i've got the batteries charging at the moment.
My only question is, should I bleed the brake system? I'm guessing so, as a catasprophic failure like that must have introduced air into the brake system,
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