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Old 03-13-2018, 01:18 PM   #1
saturnsctwo
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2001 SC2
Default mastrer cylinder question

on my 2001 sc2 I never really paid attention to this but it has 4 lines coming from it. my car is in the shop now getting the lines from the master cylinder to the rear of the car replaced with copper nickel lines because one was leaking & rusting through which I never knew. good thing they caught this otherwise I might be plastered to a tree about now. anyway why does it have 2 lines coming to the rear? are each wheel on a separate system?

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Old 03-13-2018, 02:35 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: mastrer cylinder question

Here's the technical description for Saturn brake systems, with or without ABS. Some things to keep in mind; brake systems may or may not use a brake proportioning valve to prevent rear brakes locking up first during weight shifting as brakes are applied and the dual diagonal hydraulic lines to ensure if one brake fails, half the brakes are not affected and will slow a car down without pulling to one side, a safety design.

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Old 03-14-2018, 06:37 PM   #3
kmcn
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Default Re: mastrer cylinder question

That's interesting info on the brake design. I did not know they still used a diagonal system but I did notice all four lines coming out of our 2001 SL2. We have front disc and rear drum. I just assumed that the paired lines were front and rear. In older cars, there used to be an electrical switch as part of the proportioning valve. If one half of the master cylinder had pressure and the other half did not, then your BRAKE light would illuminate on the dash. I did not see anything like that on our SL2 when I redid the brakes.

What's confusing to me though, is when we had a recent failure. The right front inside pad had gotten so worn that it was metal-to-metal and the inside pad slipped loose from its "moorings"... this caused the piston to extend out and touch the caliper. The brake pedal went to the floor and did not stop the car. Luckily, it was in a parking lot so the emergency brake was able to stop the car before any damage occurred.

I wonder why the diagonal braking did not work on the other two wheels (LF and RR)??

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Old 03-14-2018, 07:05 PM   #4
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Default Re: mastrer cylinder question

My guess is with half the brakes gone, you're down to two (instead of four) brakes with half a braking system. 50% brakes isn't going to stop any time soon.

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Old 03-14-2018, 07:26 PM   #5
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2000 L-Series 2.2L Sedan
Default Re: mastrer cylinder question

Quote:
Originally Posted by kmcn View Post
What's confusing to me though, is when we had a recent failure. The right front inside pad had gotten so worn that it was metal-to-metal and the inside pad slipped loose from its "moorings"... this caused the piston to extend out and touch the caliper. The brake pedal went to the floor and did not stop the car. Luckily, it was in a parking lot so the emergency brake was able to stop the car before any damage occurred.

I wonder why the diagonal braking did not work on the other two wheels (LF and RR)??
What conclusion was reached as to why there was a loss of hydraulic pressure (brake pedal dropping to the floor when depressed) after the mechanic, or you, performed the latest brake repair?

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