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Tool Talk Discussion Forum

Topic: Hydraulic Brake Pressure?
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Glenn F.

12-28-2012 14:40:56
166.181.3.229



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While replacing some brake lines on our trusty '93 Bonneville today, I got to wondering how many pounds of pressure does such a system build up when braking? Just curious.

Thanks,
Glenn F.

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t.r.k.

12-28-2012 19:17:40
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Re: Hydraulic Brake Pressure? in reply to Glenn F., 12-28-2012 14:40:56  
My old Auto mechancs teacher told a story:

Had a front wheel drive car with disk brakes that just wouldn't stop. (Probably very early '80s.)

After lots of messing,
(And one trip through a red light with both feet on the brake pedal during a test drive):

He decided to plumb a gauge into the master cylinder and see what the pressure was in the front lines. (This before anti-lock brakes)

He said he could get 4,000 psi out of the master cyl in the shop with both feet pressing the pedal. And speculated that he was getting a lot more than that when it rolled through that red light.

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Glenn F.

12-28-2012 17:17:53
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Re: Hydraulic Brake Pressure? in reply to Glenn F., 12-28-2012 14:40:56  
Thanks guys. Probably a little more than a hose & clamps would hold!

Glenn

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Butch(OH)

12-28-2012 18:28:04
107.8.47.165



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Re: Hydraulic Brake Pressure? in reply to Glenn F., 12-28-2012 17:17:53  
True story. Local garage had a sedan come in with spongy pedal that would not go away. Owner had bled and bled and bled after "fixing" a rusted brake line. I happened to drop by just as the mechanic found the problem and burst out into laughter. Rubber fuel hose and clamp.

2000 PSI is what I was always told.

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GordoSD

12-28-2012 15:47:39
216.106.244.233



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Re: Hydraulic Brake Pressure? in reply to Glenn F., 12-28-2012 14:40:56  
Around 800 psi for light braking. Up to 2000 for a"panic stop".

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old

12-28-2012 14:55:44
209.86.226.19



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Re: Hydraulic Brake Pressure? in reply to Glenn F., 12-28-2012 14:40:56  
I do not know if it is true or not but I have been told depending on the car etc it can be up wards of 1500 PSI. That is one of the reasons all lines if in spec are double flare type fittings

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