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58panel · 11-27-2003, 01:13 PM

Hi!
Been lurking and learning from all the great info on this site!
Got a problem! We installed an Chrysler new yorker front end in a project truyck! used the under floor mustang II booster and master setup. Got the metering and residual valves from Master Brakes installed.
The problem is that the system won't maintain pressure. it will pump up and work but on the initial hit it goes almost to the floor and only the rears seem to work.
This is driving us nuts!

Any suggestions?

Thanks and happy Thanksgiving!

phantom dually · 11-27-2003, 11:21 PM

What process did you use to bleed them??

toytruck · 11-27-2003, 11:49 PM

Got to be the master cylinder. Did you bench bleed it before you put it on? Or the master cylinder bore is to big for your brakes. Is the push rod the right lenght? Or the fluid bowls are too small. Compare the mustang master with the new yorker. They need to be close to the same in fluid volume and bore size. But more volume and less bore is even better. Hope this will help to get you on the right track.

58panel · 11-28-2003, 09:45 AM

PHANTOM.
Thanks for the reply.
The only method we have not tried yet is a pressure flush with a machine. we bench bled the m/c and then pedal bled the system til the leg gave out! LOL

58panel · 11-28-2003, 09:52 AM

Toy Truck
Thanks for the reply.
We just got the new yorker m/c in late wed. the only difference just from a quick glance is the stroke looks longer. everything else seems to be the same or close to it.
this is the second "new" m/c we have tried and even tried a rebuilt one from another supplier with the same results. we replaced one caliper we thought was bad and same same.

maybe we need to try the machine pressure bleed to see if there is a secret air bubble we are missing?

Truckhead · 12-07-2003, 02:17 PM

For the underfloor brake setup, you have to run checkvalves inline to keep the brakefluid from draining back to the master cylinder. Check www.Nolimit.net they should have the parts you need.

58panel · 12-08-2003, 07:59 AM

Hi Truckhead
we got the 2lb residual valves for the front and a 10lb one for the rears and a metering block that goes to the front only from mpbrakes.
we got the brakes to work but they still don't seem right. can't seem to get the pressure to the fronts hi enough.
we are using an adjustable proportioning valve to the rears

thanks

MOTHERTRUCKERS · 12-12-2003, 09:52 AM

Are you using 3/16 up front and 1/4 lines to the back with new brake hoses front and rear?

58panel · 12-12-2003, 10:07 AM

MT
used the original hard lines front and back. same size both ways. replaced front hoses. tried mustang II master as recommended. ended up with chry new yorker master and finally got to where we are now. we are thinking the original pedal has too much leverage for the master?

MOTHERTRUCKERS · 12-12-2003, 10:42 AM

If your using 1/4" lines all the way around i bet thats the problem. Disc brakes need more pressure and not volume to work correctly, the 3/16 line is recommended for disc brakes to create more pressure to the calipers.

58panel · 12-13-2003, 10:48 AM

MT
had to replace a piece of line. it is 3/16 to calipers.
could the length of the booster stroke be restricting the full stroke in the m/c?

MOTHERTRUCKERS · 12-13-2003, 12:15 PM

If you have 3/16 line from the master to the calipers with new hoses i'm stumped, we have used the under the floor power brake kitsin either the disc/drum or disc/disc from BROTHERS along with a FATMANS MII with no problems in my customers trucks, but we rebuild the rear brakes including wheel cylinders/calipers and all new lines when we do them. I don't know about the new yorker mas cyl but I have the REYBESTOS tech tollfree # and can give you my dealer pin# in an email.

11-27-2003, 01:13 PM	#1
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	No Brakes Hi! Been lurking and learning from all the great info on this site! Got a problem! We installed an Chrysler new yorker front end in a project truyck! used the under floor mustang II booster and master setup. Got the metering and residual valves from Master Brakes installed. The problem is that the system won't maintain pressure. it will pump up and work but on the initial hit it goes almost to the floor and only the rears seem to work. This is driving us nuts! Any suggestions? Thanks and happy Thanksgiving!

11-27-2003, 11:21 PM	#2
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,792	What process did you use to bleed them?? __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

11-27-2003, 11:49 PM	#3
toytruck 5-7 dropped 87 CC Dually Join Date: Sep 2003 Location: bay city mi Posts: 326	Got to be the master cylinder. Did you bench bleed it before you put it on? Or the master cylinder bore is to big for your brakes. Is the push rod the right lenght? Or the fluid bowls are too small. Compare the mustang master with the new yorker. They need to be close to the same in fluid volume and bore size. But more volume and less bore is even better. Hope this will help to get you on the right track. __________________ I rather be in my 77 Sanger Picklefork Jet Hydro!

12-12-2003, 09:52 AM	#8
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	Are you using 3/16 up front and 1/4 lines to the back with new brake hoses front and rear? __________________ Rest in Peace Ed. Thanks for all the good times.

12-12-2003, 10:42 AM	#10
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	If your using 1/4" lines all the way around i bet thats the problem. Disc brakes need more pressure and not volume to work correctly, the 3/16 line is recommended for disc brakes to create more pressure to the calipers. __________________ Rest in Peace Ed. Thanks for all the good times.

11-28-2003, 09:45 AM	#4
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	PHANTOM. Thanks for the reply. The only method we have not tried yet is a pressure flush with a machine. we bench bled the m/c and then pedal bled the system til the leg gave out! LOL

11-28-2003, 09:52 AM	#5
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	Toy Truck Thanks for the reply. We just got the new yorker m/c in late wed. the only difference just from a quick glance is the stroke looks longer. everything else seems to be the same or close to it. this is the second "new" m/c we have tried and even tried a rebuilt one from another supplier with the same results. we replaced one caliper we thought was bad and same same. maybe we need to try the machine pressure bleed to see if there is a secret air bubble we are missing?

12-07-2003, 02:17 PM	#6
Truckhead 18436572 Join Date: Aug 2003 Location: Waynesboro, Va. Posts: 488	For the underfloor brake setup, you have to run checkvalves inline to keep the brakefluid from draining back to the master cylinder. Check www.Nolimit.net they should have the parts you need.

12-08-2003, 07:59 AM	#7
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	Hi Truckhead we got the 2lb residual valves for the front and a 10lb one for the rears and a metering block that goes to the front only from mpbrakes. we got the brakes to work but they still don't seem right. can't seem to get the pressure to the fronts hi enough. we are using an adjustable proportioning valve to the rears thanks

12-12-2003, 10:07 AM	#9
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	MT used the original hard lines front and back. same size both ways. replaced front hoses. tried mustang II master as recommended. ended up with chry new yorker master and finally got to where we are now. we are thinking the original pedal has too much leverage for the master?

12-13-2003, 10:48 AM	#11
58panel Registered User Join Date: Sep 2003 Location: Cottonwood Arizona Posts: 29	MT had to replace a piece of line. it is 3/16 to calipers. could the length of the booster stroke be restricting the full stroke in the m/c?

12-13-2003, 12:15 PM	#12
MOTHERTRUCKERS Registered User Join Date: Dec 1999 Location: BRADENTON FLA Posts: 3,269	If you have 3/16 line from the master to the calipers with new hoses i'm stumped, we have used the under the floor power brake kitsin either the disc/drum or disc/disc from BROTHERS along with a FATMANS MII with no problems in my customers trucks, but we rebuild the rear brakes including wheel cylinders/calipers and all new lines when we do them. I don't know about the new yorker mas cyl but I have the REYBESTOS tech tollfree # and can give you my dealer pin# in an email. __________________ Rest in Peace Ed. Thanks for all the good times.



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