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Steering, Suspension & Brakes Post your discussions about steering, suspension, shocks, control arms and brakes here!

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  #1  
Old 02-10-2019, 02:02 PM
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Spongy Brake Pedal

The brake pedal on my Marauder is really spongy. There is a lot of travel before the brakes begin to grab. And it seems like if I keep pushing, the pedal keeps moving towards the floor. I have the TCW SS brake lines, so I know it's not rubber hoses expanding. The brake fluid lever is fine. I also flush through new brake fluid each spring.

Is this a bad master cylinder or vacuum booster?

Thanks,
Curt
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  #2  
Old 02-10-2019, 03:16 PM
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Rotors and pads are in good shape?
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  #3  
Old 02-10-2019, 04:04 PM
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Yes. New front rotors last spring and I run Carbotech AX-6 auto cross pads on all four corners.
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  #4  
Old 02-10-2019, 05:33 PM
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If it’s spongy, it could be your master cylinder. Typically when a booster fails, the pedal gets hard.
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Old 02-10-2019, 05:42 PM
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Or you need to bleed the brakes again...
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  #6  
Old 02-10-2019, 05:53 PM
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I am having the same issue. I read that this could also be caused by the ABS system. My plan is to get a 10 and 12mm brass plug and plug the master cylinder and see if the pedal firms up and doesn't slowly go to the floor. I am afraid if it doesn't go to the floor I will be in real trouble because ABS parts are hard to come by for our cars.
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  #7  
Old 02-10-2019, 07:23 PM
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Quote:
Originally Posted by TooManyFords View Post
Or you need to bleed the brakes again...

^^^^^
This, with ABS pump cycle.
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  #8  
Old 02-10-2019, 07:29 PM
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ABS delete

http://www.prbmachining-absdeleteman...talog/i43.html


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  #9  
Old 02-10-2019, 07:59 PM
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Install SS brake lines, you will feel the difference.
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  #10  
Old 02-10-2019, 08:11 PM
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Quote:
Originally Posted by Gerry24 View Post
Install SS brake lines, you will feel the difference.
Already have the TCE SS brake lines.
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  #11  
Old 02-10-2019, 08:12 PM
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Quote:
Originally Posted by MyBlackBeasts View Post
^^^^^
This, with ABS pump cycle.
I'm not familiar with this. Can you provide some additional information?
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  #12  
Old 02-10-2019, 08:30 PM
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MyBlackBeasts MyBlackBeasts is offline
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Quote:
Originally Posted by crouse View Post
I'm not familiar with this. Can you provide some additional information?

Air gets trapped in the ABS pump/lines which makes pedal spongy even after bleading brakes many times.


Take to dealer for bleed with ABS pump cycle or get a scan tool that cycles pump and do yourself.
__________________

WLB
BB#1) 1996 ImpalaSS - 16,500 miles - 100% stock
______________________________ ___________

BB#2) 2003 Marauder (300a) - 34k miles - Daily Driver
#2912 of 7093
Conceived 8/6/2002
Delivered 9/19/2002
Adopted 8/10/2011
Trilogy 242 - Self Installed 9/9/12 (0-60 5.5 sec)
Pioneer 6x8 Front
Legacy 600w 6x9 Rears
JL 6.5 SubWoofer
K&N CAI
Window tint 50% rear/35% front
FBM CHMSL with Strobe mod 7/1/12
DR Deep Aluminum Trans Pan
Sparta FOMOCO Racing 8.8 Girdle
Mo's Dyno Tune
Gorilla Nuts - The System
Ford Racing 4.10s, 31 spline Cobra carrier & axles 7/1/12
Powder Coat Axle Housing 7/1/12
CME HP Rear Control Arms & Watts Link 7/1/12
______________________________ ________________

Rex "SC Cheesehead" Weinbender 11-14-13
Ed "Baaad GN" Linthicum 8-6-2014
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  #13  
Old 02-10-2019, 09:13 PM
Logan86 Logan86 is offline
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I had a similar situation and it was a failed master cylinder. Bench bleed, go get the ABS bleed down at a dealer and then enjoy a nice firm pedal again.
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