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#1
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
02-10-2019, 03:16 PM
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Rotors and pads are in good shape?
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#3
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
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.
__________________
2003 DBP # 153 Whipple 3.4 in coming soon 2004 Black Trilogy #43
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#5
02-10-2019, 05:42 PM
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Or you need to bleed the brakes again...
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#6
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.
__________________
 If you’re in control, you’re not going fast enough. – Parnelli Jones If your wife's having a good time and you're not, you're still having a better time than if you're having a good time and she's not. - Red Green  2004 Marauder 300A - Garage Queen  1025 of 3213. It is one of 1237 in black and one of 2000 w/o the moonroof option. Performance 4:10's, rear Adco, front Eibachs w/ KYB struts, Working oil pressure gauge, JLT CA Kit, Fumoto Oil Drain Valve, Remote Oil Filter, TCE SS Brake Lines, Prostop drilled and slotted rotors. Dress Power by Ford coil covers, Maruder sill plates, God's head steering wheel emblem, spoiler, front and rear splash gaurds, Custom dead pedal, LED lights for engine bay, interior and gauges. 64' Marauder Sail Panel for rear badge, custom God's head badge in grill. 2009 Hyundai Sonata DD 2007 Chrysler Pacifica 2003 Marauder 300B RIP LOC: Clermont Florida
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#7
02-10-2019, 07:23 PM
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Quote:
^^^^^ This, with ABS pump cycle.
__________________
 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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#8
02-10-2019, 07:29 PM
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ABS delete
 http://www.prbmachining-absdeleteman...talog/i43.html Sent from my iPhone using Tapatalk Pro
__________________
 Cobra short block / ProCharger F1-A / Cog drive upgrade / Manley valves / Brian Tooley Racing valve springs / 80# inj. / -8 fuel line / -6 return / Aeromotive 340 pumps and regulator / 2012 GT500 TR6060 six speed / twin disc clutch / Driveshaft Shop GT500 upgraded CV joint shaft / BA5000 blow thru MAF/ 4.10's / Ford Racing 31 spline set up and Girdle / Metco D.S. safety loop / Stainless Works headers, cats, and everything else out back / ClassGlass hood / Bob's hood strut mod / Hurst line lock / Metco control arms / Addco front and rear sway bars / Monroe severe duty shocks all around / Race concepts rotors / Badgeless grille / 35% tint / FBM's interior LED kit and ambient lighting kit / Pioneer FB700 deck / kenwood speaker 4 Ch. / Rockford Fosgate 10" sub and amp / Kicker 6 X 8's all around / back up cam / bluetooth / Pioneer Xm / 704 RWHP 603 RWTQ tuned by Mo's Speedshop.
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#9
02-10-2019, 07:59 PM
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Install SS brake lines, you will feel the difference.
__________________
 Righteous Indignation 03 300A 4055 of 7838 4054 of 7093 in Black. Born 8/23/02 Adopted in 1/15.
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#10
02-10-2019, 08:11 PM
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Quote:
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#11
02-10-2019, 08:12 PM
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Quote:
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#12
02-10-2019, 08:30 PM
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Quote:
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
02-10-2019, 09:13 PM
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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.
__________________
2003 Mercury Marauder 300A Former Owner: Joe Walsh 2015 Mustang GT PP Guard Metallic Exterior 2018 F-150 King Ranch 2WD, 3.5 EcoBeast
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#14
05-24-2019, 11:26 AM
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Rock Auto lists a Raybestos, Cardone, Centric or AC Delco master cylinder. Anyone have any recommendations? Or how about NAPA?
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#15
05-24-2019, 01:33 PM
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I have the same problem now. My OEM brakes on the 2003 Marauder feel mushy and inadequate for a fast stop. Scared the hell out me a couple of times...almost had to take the ditch to avoid collision.
I was looking to upgrade brakes. Has anyone had any experience with the Power Stop® Z23 (or Z26) Evolution Drilled and Slotted Brake Kit with Calipers? https://www.carid.com/2003-mercury-m...574631010.html HL
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