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04-28-2010, 11:11 PM
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#1
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Name: Blackdog
Title: Hillbilly Deluxe
Status: Not Here
Join Date: Jan 2008
Location: Fremont NC.
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Posts: 801
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Brake pedal travel with 4wheel disc
That is my question. Since my truck now has a 80 disc in the rear I am curious how far the brake pedal goes for you guys that have ran full discs for a while? I have done an old school brake bleed all the way around and the pedal wasn't far from the floor using it decently to stop. Next I did a bleed with a new bleeder kit and on a hard stop the pedal would go half to the floor and I could feel the ABS kicking in.
Now before when I had drums in the rear I just barely had to push the pedal and that was all the braking I needed. Just curious if 4wheel disc should act the same as drums in the rear or is my brake pedal about where it should be or do I need to do more bleeding?
__________________
-98.5 24v 3500 And Then Some 4x4, Sold
-01 24v 3500 2wd 5sp. "Money Maker"
-00 Ford Excursion 4x4 7.3. A few odds and ends
-07 5.9 Mega Cab 4x4
"Chariot Of Ecstasy" Pulling Team
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04-28-2010, 11:56 PM
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#2
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Name: 01 smoke
Title: learnin every day
Status: Not Here
Join Date: Mar 2009
Location: New Castle, IN.
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Posts: 486
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Im not 100% sure but I think that the master cylinders are different for disc and drum brakes.
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01 Dodge, Studs & Fire ringed, Edge hot comp, Smarty, Weston 6X12s, stage II Monster pump, Hamilton 178-208 cam, push rods and springs, Fass HD 150 and sump, II Silver 64, PDI Manifold, ats trans, co-pilot and intake, afe, Dana 80 with locker and bars.
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04-29-2010, 02:14 AM
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#3
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Name: Blackdog
Title: Hillbilly Deluxe
Status: Not Here
Join Date: Jan 2008
Location: Fremont NC.
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Quote:
Originally Posted by 01 smoke
Im not 100% sure but I think that the master cylinders are different for disc and drum brakes.
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Well, If that is the case I am pretty sure I have the master cylinder on the parts truck the axle came from.
__________________
-98.5 24v 3500 And Then Some 4x4, Sold
-01 24v 3500 2wd 5sp. "Money Maker"
-00 Ford Excursion 4x4 7.3. A few odds and ends
-07 5.9 Mega Cab 4x4
"Chariot Of Ecstasy" Pulling Team
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04-29-2010, 06:45 AM
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#4
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Name: Street sleeper
Title: Part-Time Puller!!
Status: Not Here
Join Date: Feb 2009
Location: WI
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Posts: 411
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My 2002 has 1/4 pedal travel to stop effectively.
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96 Dodge 2500 Regcab 4x4 12 valve, 100 plate, 4k gsk, 19.5* timing, 215 inj., Goerend's Billet Trans, AirDog200. 355hp and 960ft-lbs
02 Dodge 2500 Quadcab LB 4x4 24 valve 6spd Edge Attitude, HX35/S475, Scheid L1, Big Stick, and Valair DD
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04-30-2010, 12:49 PM
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#5
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Name: jmd025
Title: Occasional Poster
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Join Date: Jul 2008
Location: NE Louisiana
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Posts: 444
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i probably move my pedal 1 full inch for a panic stop.....normal stopping is VERY little pedal.
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A VP truck with mods that would make a 12v or CR fast.
2013 Passat TDI
Thanks to Weston, and Ronnie @ Altered Diesel Wurks
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04-30-2010, 12:51 PM
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#6
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Name: j-rod
Title: Up to no good
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Join Date: Jun 2008
Location: PA
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Posts: 3,628
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With drums, you have a residual pressure check valve that keeps pressure on the shoes even when the brakes are not applied. This is not needed with discs. I'm not sure if this valve is located in the master cylinder or if it is located in the combination valve, etc. (I don't think this is related to your problem, as you would just burn through pads much quicker than typical.)
It does sound like you have way too much travel...I barely push my pedal down to stop.
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Jared
14 CC LB
99 QC LB
01 TDI
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04-30-2010, 02:56 PM
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#7
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Name: FIVEOLOGY
Title: COW TIPPER
Status: Not Here
Join Date: Nov 2007
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Posts: 308
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Not 100% sure but I would assume that either the Master or Proportioning Valve (or maybe both) are different on the 4 wheel disc trucks. Just generally speaking from years of doing this type of swap on various vehicles, you usually need a different master cylinder or prop valve (or both) to get the most out of the swap.
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01 2500 Cummins Quad Cab 4X4
5spd, ISSPROS, FASS, SBC OFE
Dyno 10/21/07: 481hp 945lb-ft (SCHEID 100s)
Dyno 5/18/08: 536hp 1048lb-ft (MACH 4s)
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05-01-2010, 10:07 AM
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#8
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Name: isbsinkinson
Title: Rookie
Status: Not Here
Join Date: Feb 2008
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Posts: 4
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I have the same axle swap on my 99 & it does not take much pedal at all to get it to stop. I did not change any parts but the axle.
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05-02-2010, 11:31 PM
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#9
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Name: Blackdog
Title: Hillbilly Deluxe
Status: Not Here
Join Date: Jan 2008
Location: Fremont NC.
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Posts: 801
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Well, I did check the numbers on the master cylinder and they were the same but I don't have the prop valve on the parts truck to check those numbers. I did old school bleed all the brakes six times each and found alot of air in the front lines and after that the brakes act and the pedal travels about the same as my Excursion which is the only other 4 wheel disc I got to compare it to.
If I don't like how it is acting I will look into the prop valve but right now I think it is good. Just need more seat time.
__________________
-98.5 24v 3500 And Then Some 4x4, Sold
-01 24v 3500 2wd 5sp. "Money Maker"
-00 Ford Excursion 4x4 7.3. A few odds and ends
-07 5.9 Mega Cab 4x4
"Chariot Of Ecstasy" Pulling Team
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