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Power Steering and Brakes Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Car Troubleshooting Guest Anonymous Poster n8brophy@hotmail.com Feb 24, 2007, 11:19 AM Post #1 of 3 (1792 views) Power Steering and Brakes Sign In So last night i was delivering this trailer in my Chevrolet Express 15 passenger van. When i get to the place and go to park the trailer my power steering stops working. and it takes a whole lot more effort to make the brakes work... almost like the vacuum line in the brakes broke... the fluids are all fine... but im stumped. why would both go at the same time? steve01832 Veteran Feb 24, 2007, 7:16 PM Post #2 of 3 (1781 views) Re: Power Steering and Brakes Sign In If you have the 4.3 liter engine the brake assist comes off of the power steering. If you look behind the master cylinder you won't see the traditional round brake booster. It is one of GM's "better" designs. You should first check the power steering belt tension. If it's ok, then the pump may have failed. Steve DanD Veteran / Moderator Feb 25, 2007, 6:02 PM Post #3 of 3 (1772 views) Re: Power Steering and Brakes Sign In Oh Yea. I can just about picture what has happened to the system. Like Steve said the power brakes on these vans use what is called hydra boost that the power brake assist comes from the power steering pump. Why; because there’s a chance that under heavy load the engine will not make enough vacuum to run the vacuum power brake system if it were used. These vans also have variable rate steering: EVO (electronic variable orifice) is its official name. Meaning that at lower speeds the steering can be turned with one finger for ease of parking lot manoeuvres: once above a certain speed the power steering assist is lowered making the steering wheel harder to move; giving better road feel. With all this going on the poor power steering pump is working its arse off because it’s a positive displacement pump; in other words the pump, pumps as hard as it can all the time. With EVO they restrict the fluid flow to the steering gear which makes the pump’s internal pressures soar and the effort to turn the pump go through the roof. The end result is the pump’s driveshaft breaks because of all this effort to turn it. The first one I came across you couldn’t see a physical problem with the pump, the pulley or belt; everything looked normal and in place. What happen’s is the pump’s driveshaft breaks inside; behind the seal and the thing doesn’t produce any pressure. Take the belt off and you’ll likely be able to pull the pulley and a portion of the pump’s driveshaft right out the end of the pump. Dan. Just rereading this; damn I’m long winded LOL but I didn’t know how else to explain what has likely happened. Canadian "EH" (This post was edited by DanD on Feb 25, 2007, 6:05 PM)   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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