1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
#1
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Car: 1986 Pontiac Firebird Trans Am
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1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
Hi,
For 1986 Trans Am with rear disc brakes:
I'll replace the stock proportioning brake valve spring for the 1NCR5 Grainger or similar spring.
For this "upgrade" I must bleed rear brakes pushing air/fluid from proportioning valve to passenger side rear wheel (first) and driver side rear wheel (second).
What could be the necessarry number of pedal pumps in order to complete this bleeding process?
Thanks
For 1986 Trans Am with rear disc brakes:
I'll replace the stock proportioning brake valve spring for the 1NCR5 Grainger or similar spring.
For this "upgrade" I must bleed rear brakes pushing air/fluid from proportioning valve to passenger side rear wheel (first) and driver side rear wheel (second).
What could be the necessarry number of pedal pumps in order to complete this bleeding process?
Thanks
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
It takes a little over half a beer (or glass of wine, if that's your preferred adult beverage) to sit back and watch the fluid dribble out of the right bleeder (being careful of course to refill the master cyl between sips), and then the rest of it while you watch the left.
Not sure why you'd want to get involved with "pedal pumps". That sounds a little like "work", which is best avoided whenever possible.
Not sure why you'd want to get involved with "pedal pumps". That sounds a little like "work", which is best avoided whenever possible.
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#6
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
:: I too have always used the gravity method. It really the best way to get the air out.
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Car: 1986 Pontiac Firebird Trans Am
Engine: 305 Tuned Port Injection
Transmission: The famous 700R4
Axle/Gears: No idea
Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
The reason for this scientific question is because I do this job alone.
So, for each pedal pump (depress) I put a piece of wood between pedal and seat for hold the pedal, then I go to the rear wheel, open the bleeder, and the brake fluid flows about 15 cms. ( aprox. 6 inch). Close the bleeder, go to the driver seat and repeat again.
Then, if the distance between the proportioning valve to rear wheel is 3.5 meters (aprox. 138 inch), I'll need to repeat this process 350/15 = 23 times in order to remove the last air bubble.
If someone can help me with a "mathematical calculation" of this question, it would be of great help.
Thanks again
So, for each pedal pump (depress) I put a piece of wood between pedal and seat for hold the pedal, then I go to the rear wheel, open the bleeder, and the brake fluid flows about 15 cms. ( aprox. 6 inch). Close the bleeder, go to the driver seat and repeat again.
Then, if the distance between the proportioning valve to rear wheel is 3.5 meters (aprox. 138 inch), I'll need to repeat this process 350/15 = 23 times in order to remove the last air bubble.
If someone can help me with a "mathematical calculation" of this question, it would be of great help.
Thanks again
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#9
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
You are making it very complicated. Open bleeder. stick a tubing onto bleeder valve stick other end in a jar. Let it dribble out until you see no air in the tubing, close bleeder valve check master cylinder keep top up. Replace master cylinder cover after each refill.
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
^^^ This ^^^
Although to be honest, you don't even really NEED the tubing, especially if your old fluid is all brown and funky; you can just watch it until clean fluid starts to dribble out.
No need for "pedal pumps". No point in worrying about it unless (a) you are in a hurry, and (b) you have an assistant. Sounds like neither of those 2 things apply here.
Although to be honest, you don't even really NEED the tubing, especially if your old fluid is all brown and funky; you can just watch it until clean fluid starts to dribble out.
No need for "pedal pumps". No point in worrying about it unless (a) you are in a hurry, and (b) you have an assistant. Sounds like neither of those 2 things apply here.
#11
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
Or get yourself a pneumatic brake bleeder and call it a day.
https://www.harborfreight.com/brake-...der-92924.html
33 bucks!
https://www.harborfreight.com/brake-...der-92924.html
33 bucks!
#12
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Car: 1988 Trans Am GTA
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
The reason for this scientific question is because I do this job alone.
So, for each pedal pump (depress) I put a piece of wood between pedal and seat for hold the pedal, then I go to the rear wheel, open the bleeder, and the brake fluid flows about 15 cms. ( aprox. 6 inch). Close the bleeder, go to the driver seat and repeat again.
Then, if the distance between the proportioning valve to rear wheel is 3.5 meters (aprox. 138 inch), I'll need to repeat this process 350/15 = 23 times in order to remove the last air bubble.
If someone can help me with a "mathematical calculation" of this question, it would be of great help.
Thanks again
So, for each pedal pump (depress) I put a piece of wood between pedal and seat for hold the pedal, then I go to the rear wheel, open the bleeder, and the brake fluid flows about 15 cms. ( aprox. 6 inch). Close the bleeder, go to the driver seat and repeat again.
Then, if the distance between the proportioning valve to rear wheel is 3.5 meters (aprox. 138 inch), I'll need to repeat this process 350/15 = 23 times in order to remove the last air bubble.
If someone can help me with a "mathematical calculation" of this question, it would be of great help.
Thanks again
https://www.1aauto.com/how-to-bleed-...lf/video/46296
#13
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
I was really impressed with the gravity method also.
#14
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
Get a Mityvac, or a pressure bleeder system.
I use a Mityvac that pulls the fluid into a gatorade bottle, I use a 1 way check valve in between the brake bleeder and the gatorade bottle, and I connect the Mityvac to the gatorade bottle. The vac creates vacuum in the gatorade bottle, which pulls the fluid from the caliper into the bottle. While itpulling fluid, I keep the reservoir topped off.
Its significantly cheaper than the Motiv option below, but the Motiv option is definitely better.
Mityvac.
https://www.harborfreight.com/mityva...AaAp7uEALw_wcB
Or a Motiv pressure bleeder.
https://www.summitracing.com/parts/m...oaAu93EALw_wcB
I use a Mityvac that pulls the fluid into a gatorade bottle, I use a 1 way check valve in between the brake bleeder and the gatorade bottle, and I connect the Mityvac to the gatorade bottle. The vac creates vacuum in the gatorade bottle, which pulls the fluid from the caliper into the bottle. While itpulling fluid, I keep the reservoir topped off.
Its significantly cheaper than the Motiv option below, but the Motiv option is definitely better.
Mityvac.
https://www.harborfreight.com/mityva...AaAp7uEALw_wcB
Or a Motiv pressure bleeder.
https://www.summitracing.com/parts/m...oaAu93EALw_wcB
#15
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
+1 on the mighty vac. i recently installed all new brake components on a car i'm building (master cylinder, rotors, calipers, lines, etc... - i mean everything!) so there was no fluid anywhere in the system. for the life of me i couldn't get the rear brakes properly bled. there was fluid back there, but couldn't get all the air out of the new lines. i even let it sit for a whole day and periodically checked it / added fluid. gravity method just wouldn't work for me. got a mighty vac and made this job super easy.
#16
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Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
+1 on the mighty vac. i recently installed all new brake components on a car i'm building (master cylinder, rotors, calipers, lines, etc... - i mean everything!) so there was no fluid anywhere in the system. for the life of me i couldn't get the rear brakes properly bled. there was fluid back there, but couldn't get all the air out of the new lines. i even let it sit for a whole day and periodically checked it / added fluid. gravity method just wouldn't work for me. got a mighty vac and made this job super easy.
Use a turkey baster (or the mityvac) suck all the fluid out of the open reservoir, taking care to keep enough fluid in there so the ports on the bottom remain submerged.
Fill it with clean fluid.
Repeat as necessary till the fluid is spotless and any debris is removed from the reservoir.
The, do the brake flush.
This way you aren't pulling old/dirty fluid from the reservoir through the lines, and instead are just pulling nice NEW fluid through the lines.
Heck, you could probably do the suck/fill onto master once a year if you really wanted to ensure the fluid was always super clean.
#17
Supreme Member
Re: 1NCR5 upgrade: How many "pedal pumps" to bleed rear brakes?
Get a Mityvac, or a pressure bleeder system.
Its significantly cheaper than the Motiv option below, but the Motiv option is definitely better.
Mityvac.
https://www.harborfreight.com/mityva...AaAp7uEALw_wcB
Or a Motiv pressure bleeder.
https://www.summitracing.com/parts/m...oaAu93EALw_wcB
Its significantly cheaper than the Motiv option below, but the Motiv option is definitely better.
Mityvac.
https://www.harborfreight.com/mityva...AaAp7uEALw_wcB
Or a Motiv pressure bleeder.
https://www.summitracing.com/parts/m...oaAu93EALw_wcB
https://www.harborfreight.com/brake-...der-92924.html
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