Scarebird brake issues
- my5thmopar
- Sweptline.ORG Pioneer
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Scarebird brake issues
I've already talked with another member here that has a similar experience with his scarebird front disks. The brakes stop the truck good now but, I really don't like the pedal feel. I'm not looking for a fix to my brakes in this thread...... I'm just trying to find out if others have had similar experiences. I would also like to know your scarebird setup. When I changed to front disks, I immediately noticed a lower pedal and kind of soft. The manual drums all around would stop the truck quickly with a high hard pedal. I changed when I put the 440 in and I'm trying to modernize the truck. My setup started with manual front disk and rear drums. That wasn't great pedal and went to power with a 9 inch booster. That didn't help either so, I added rear disks. My pedal moves too much for my liking. Block off either front or rear and the pedal is high and hard. Put both together and the pedal will move a few inches. My theory is the pedal ratio is off and there isn't enough fluid volume. Anyone else with scarebird issues working good or bad? Craig
1964 D100 Utiline
2019 Ram Classic
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- Sweptline.ORG Pioneer
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Re: Scarebird brake issues
Small diameter master has to travel a lot further to move enough fluid to fill all 4 caliper cylinders. But PSI is higher so pedal force (feel) is lighter.
- my5thmopar
- Sweptline.ORG Pioneer
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Re: Scarebird brake issues
Agree. I’m using a 80s Dodge truck 1 1/8 MC now and it helped. I may tryPwrWgnDrvr wrote: ↑Sat Aug 14, 2021 10:11 pmSmall diameter master has to travel a lot further to move enough fluid to fill all 4 caliper cylinders. But PSI is higher so pedal force (feel) is lighter.
A larger one or even one of the step MC but they say it is hard to bleed. Craig
1964 D100 Utiline
2019 Ram Classic
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viewtopic.php?f=34&t=40251
2019 Ram Classic
viewtopic.php?f=34&t=36025&hilit=build
viewtopic.php?f=34&t=40251
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- Sweptline.ORG Member
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Re: Scarebird brake issues
I used scarebird on my 60 d 100. It has crown Vic rear axle with rear disc and a master cylinder with booster from a 93 camaro. I also used an adjustable proportioning valve. As I recall I redrilled a new hole in the brake pedal about an inch lower which gave more travel to the piston. The pedal is high with a firm feel. I am happy with it.
Late 65 w 200.
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
- my5thmopar
- Sweptline.ORG Pioneer
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- Joined: Thu Aug 08, 2013 8:51 pm
- City: Columbia
- State: TN
Re: Scarebird brake issues
Isn't that mc 1 inch bore? Are you saying that you had an issue with the position or travel of the pedal or both? I'm trying to visualize how that effects the setup. CraigBigBlockTrucks wrote: ↑Sun Aug 15, 2021 11:32 amI used scarebird on my 60 d 100. It has crown Vic rear axle with rear disc and a master cylinder with booster from a 93 camaro. I also used an adjustable proportioning valve. As I recall I redrilled a new hole in the brake pedal about an inch lower which gave more travel to the piston. The pedal is high with a firm feel. I am happy with it.
PS I think you’re saying you drilled pedal to get the ratio closer to 4:1 which would help the pedal travel. I’m going to try that for my fix. Thanks
Last edited by my5thmopar on Mon Aug 16, 2021 11:10 am, edited 1 time in total.
1964 D100 Utiline
2019 Ram Classic
viewtopic.php?f=34&t=36025&hilit=build
viewtopic.php?f=34&t=40251
2019 Ram Classic
viewtopic.php?f=34&t=36025&hilit=build
viewtopic.php?f=34&t=40251
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- Sweptline.ORG Pioneer
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- Joined: Wed Dec 31, 1969 6:00 pm
- Location: Walnut Creek, CA
Re: Scarebird brake issues
A master cannot have more travel than the max it is designed/cast for.
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- Sweptline.ORG Member
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Re: Scarebird brake issues
my5thmopar wrote: ↑Sun Aug 15, 2021 12:20 pmIsn't that mc 1 inch bore? Are you saying that you had an issue with the position or travel of the pedal or both? I'm trying to visualize how that effects the setup. CraigBigBlockTrucks wrote: ↑Sun Aug 15, 2021 11:32 amI used scarebird on my 60 d 100. It has crown Vic rear axle with rear disc and a master cylinder with booster from a 93 camaro. I also used an adjustable proportioning valve. As I recall I redrilled a new hole in the brake pedal about an inch lower which gave more travel to the piston. The pedal is high with a firm feel. I am happy with it.
PS I think you’re saying you drilled pedal to get the ratio closer to 4:1 which would help the pedal travel. I’m going to try that for my fix. Thanks
I believe it is a 1 inch bore. I redrilled for alignment reasons. I don’t know the bore of the original as there wasn’t anything when I started.
I did all of this ten plus years ago. It still works as well as ever. I was always curious how well it would work with weight in the truck.
Late 65 w 200.
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
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- Sweptline.ORG Member
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- Joined: Mon Dec 27, 2010 4:49 pm
- City: Ijamsville
- State: MD
Re: Scarebird brake issues
We've already spoken about this, but I'll throw my $.02 in on the thread for posterity. I've gone back and forth on my scarebird m/c and prop valve setup. I started with a 1 1/8" m/c and a GM PV2 prop valve. Truck stopped well, but pedal was way too soft. Probably 4"+ of travel. I changed to an 80's C20 1 1/4" m/c; pedal feel was great but the truck required too much effort to stop. I suspect this was actually due to the fact that I later discovered my loaded AC Delco front calipers apparently came without any grease on the slider pins and were stuck. I went back to a 1 1/8" for a while but recently seem to have settled on a good working combo. I'm now running a 1 1/4" m/c from a 70's F250 (I had to slot the holes slightly) and a wilwood adjustable prop valve. I think on a non-power scarebird install a 1 1/8" would be good, but for a power install I've only been happy with the pedal feel on the 1 1/4".
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- Sweptline.ORG Member
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Re: Scarebird brake issues
JLeather wrote: ↑Wed Aug 18, 2021 7:23 amWe've already spoken about this, but I'll throw my $.02 in on the thread for posterity. I've gone back and forth on my scarebird m/c and prop valve setup. I started with a 1 1/8" m/c and a GM PV2 prop valve. Truck stopped well, but pedal was way too soft. Probably 4"+ of travel. I changed to an 80's C20 1 1/4" m/c; pedal feel was great but the truck required too much effort to stop. I suspect this was actually due to the fact that I later discovered my loaded AC Delco front calipers apparently came without any grease on the slider pins and were stuck. I went back to a 1 1/8" for a while but recently seem to have settled on a good working combo. I'm now running a 1 1/4" m/c from a 70's F250 (I had to slot the holes slightly) and a wilwood adjustable prop valve. I think on a non-power scarebird install a 1 1/8" would be good, but for a power install I've only been happy with the pedal feel on the 1 1/4".
Out of curiosity,how much does your truck weigh. I have never weighed a sweptline but my 1960 mentioned above weighs under 3500. As said it stops well with a 1 inch master. Are you still running drums in the back?
Not discounting others ideas ,just getting the info on the site and learning at the same time.
Late 65 w 200.
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
-
- Sweptline.ORG Member
- Posts: 223
- Joined: Mon Dec 27, 2010 4:49 pm
- City: Ijamsville
- State: MD
Re: Scarebird brake issues
Not sure what mine weighs. If you redrilled your pedal pivot an inch lower, however, you would have reduced your mechanical leverage on your pedal which would offset the increased hydraulic leverage of the smaller m/c bore. Or are you saying you left your pedal pivot alone and redrilled the m/c pushrod mount hole an inch lower?
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- Sweptline.ORG Member
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- State: NY
Re: Scarebird brake issues
I was concerned when I redrilled the pedal about the leverage but I did anyway to make the booster work. I have extra pedals and figured it was worth a try.JLeather wrote: ↑Wed Aug 18, 2021 11:49 amNot sure what mine weighs. If you redrilled your pedal pivot an inch lower, however, you would have reduced your mechanical leverage on your pedal which would redrilled offset the increased hydraulic leverage of the smaller m/c bore. Or are you saying you left your pedal pivot alone and redrilled the m/c pushrod mount hole an inch lower?
What I redrilled was the arm of the pedal. I didn’t change the pivot.
With the help of the vacuum booster I figured it takes less effort to do the job.
Late 65 w 200.
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
Factory LU-2 winch.
Updates: 205 transfer case,4.10 gears, disc brake Dana 60 front with lock out hubs
440 repower in the works
60 d100
383 with 727
4 wheel disc
3.73 geared rear
- my5thmopar
- Sweptline.ORG Pioneer
- Posts: 1003
- Joined: Thu Aug 08, 2013 8:51 pm
- City: Columbia
- State: TN
Re: Scarebird brake issues
I put a late 80s gm master for a 1 ton truck on today. Like @JLeather It's an 1 1/4. This was the one hydro-boost guys use and it mates with the MC. I gained about 1-1/2 inch pedal height. I haven't panic stopped since it's raining here from Ida. I'm pretty happy with the pedal feel. I need to bleed the brakes again. I'm not sure if I'm going to drill the pedal. I suspect that the pedal will be higher but, the effort might become too much even with the power booster. I'll repot back with my findings. Craig
1964 D100 Utiline
2019 Ram Classic
viewtopic.php?f=34&t=36025&hilit=build
viewtopic.php?f=34&t=40251
2019 Ram Classic
viewtopic.php?f=34&t=36025&hilit=build
viewtopic.php?f=34&t=40251