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Startup Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Fri, 17 Oct 2003 13:29:40
In Reply to: Fuel Pump, Tom, Fri, 17 Oct 2003 09:24:31 Members do not see ads below this line. - Help Keep This Site Online - Signup |
About the only lights that need to go out when starting are the Battery (alternator), ABS, and Brake Fluid lights. The Battery light should go out immediately. ABS and Brake Fluid have nothing to do with the fuel pump.
However, it's always a good idea not to drive off with the ABS and Brake Fluid lights still on. The ABS and Brake Boost use high pressure hydraulics, and the pressure comes from the ABS pump. The ABS and Brake Fluid lights will be on if the ABS pressure is below 105 bar. Normal pressure ranges from 140-180 bar.
Normally, the pressure leaks down, and when the car is started, the ABS pump starts running, bringing the pressure up. Between the residual pressure in the system, and the ABS pump, you've got enough pressure for brake boost, and you're fine as you drive off - the lights will go out in a few seconds.
However, if there was something wrong - for example, the ABS pump wasn't working - the most you'd have is the residual pressure - that goes away as you use your brakes. You're expecting you've got full brakes, but you don't. You stop at the end of your driveway, draining off the last of the pressure, and drive down the road. You come to the stop sign at the end of your street, and hit the brakes. Of course, you've done this a million times, so you know where to start braking to stop. But with no brake boost, the brakes don't work very well. Add in the time to recognize the problem, and for you to stand on the brake pedal, and the resulting stopping distance puts you in the middle of the intersection. Ooops!
I always like to let those lights go out before driving off for two reasons. First, if the brake boost system has failed, I want to know before I need my brakes. Second, I like to give the engine oil a fighting chance to get to the bearings before I put a load on the engine. Starting up and driving right off with a cold engine won't cause a failure immediately, but it takes life off the engine that will show up as the car ages.
posted by 192.249....
, Fri, 17 Oct 2003 13:29:40 <-- Viewing This Message
, Fri, 17 Oct 2003 11:29:24, Fri, 17 Oct 2003 12:14:12, Fri, 17 Oct 2003 13:55:08
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