73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Bitzer! on February 15, 2012, 04:10:34 pm
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Ok guys, here I go again!
Slightly undecided which servo/booster/M-cylinder I need.
If you've read previous, I had a new one sent over, thought I had the right one and binned the complete old unit. New one is wrong and I have nothing to reference to.
Does the pipe in the picture dictate more acurateley which type of system I have? It's going onto the C30 454.
As always, many thanks!
Andy
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The C30's I know all had hydroboost assist. What you have pictured is the vacuum line to a vacuum power brake set up, like from a C20
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Cheers Zieg, that was the only pipe that came out of it (vacuum). If it was a hyrdoboost, would it have additional pipes?
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Cheers Zieg, that was the only pipe that came out of it (vacuum). If it was a hyrdoboost, would it have additional pipes?
Hydroboost looks totally different and runs off the power steering pump as opposed to vacuum from the engine.
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You are a legend!
That last reply has put my mind at rest. I'll get a C20 one and job done.
Now you can see why it's a Bitzer haha
I owe you a beer mate
Thanks again
Andy
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You are a legend!
That last reply has put my mind at rest. I'll get a C20 one and job done.
Now you can see why it's a Bitzer haha
I owe you a beer mate
Thanks again
Andy
Do you have the booster that the white plastic piece goes into?
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No mate
Foolishly I unbolted the lot and when the new one turned up I binned the lot!
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Ok, you need everything that bolts to the firewall... I wish you were closer, I have one complete sitting on a shelf and I can't remember if the power booster has the bracket bolted or a part of it. If you have to start from scratch a set up with the highest GVW rating with vacuum assist booster. My C20 is the 8600 GVW which may be the heaviest duty 3/4 ton in 1985. Both my 1985 C20 and C30 are listed as the same 8001-9000 GVW but one is the vacuum boost and the other hydraboost...
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I wished I lived closer too. I must have paid over $2000 in shipping and a further $1500 in import tax. And the cost of the parts makes it pretty expensive hobby!
Think I've seen a recon unit for $120 so that'll do. I'll try and sell the one I've got here in the UK. If I sent it back I'd still have to pay the shipping so effectivly I'd be out of pocker further. Live and learn!
Cheers again for ya help
Andy
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Nothings easy is it!
Would you know if the bore is 1" or 1.125" ?
Struggling now to find a combo kit that can be shipped today. Tried Summit & Cardone. Anyone else you know?
** Sorry Chris if this offends **
Andy
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honestly don't know but the answer has to do with what brake booster/brake system is in the truck. The fact you are replacing both the master and booster I would think as long as the 2 mate up you are good to go. Bigger is always better if the booster can be matched to it. My $.02
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Do you have the rod? I would think it would be different between the two bores.
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No, I don't have the rod. I disconnected it from the brake pedal, unbolted from the firewall, took the brake pipes out and binned the lot!!
Foolish Englishman!!
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Please guys, getting desperate now!
Does it matter which bore I get if I get a booster/master cylinder kit complete?
Will they both marry up to the pedel and the existing brake pipes?
Almost at the stage of thinking Flintstone to stop :-\
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I would think that there wouldnt be any difference. any size bore should work.
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I think you are comparing the tandem Master to the quick take up Master. Did you see this thread? http://forum.73-87chevytrucks.com/smforum/index.php/topic,16967.msg133295.html#msg133295 Did the Master you took off Have a plastic reservoir or was it cast? If you junked the booster with the jam nut and pedal rod still attached you'll have to locate one. I am currently searching through my junk for the pedal rod since the one on my 74 is 7/16-18 and the one I need is 3/8-16.
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Hey!
Yes Vile I did have a nose at the bits. Deffo didn't have any extras except the servo hose to manifold. The unit I junked had a cast resevoir, I junked the bracket that hold it to the firewall and the rod that takes it to the pedal! What an absolute plonker!!
I still have the curly pipes that connect to the resevoir and lead to a small valve block looking part that sits across the front x-member.
Ok, here's what I'm looking to order. It's from Summit.
Would someone be kind enough to say yes or no??
SUM760125 (pedel connector etc)
2132NA (servo + Master cylinder)
Pretty please!!
ta
Andy
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That should work as long as they're both 3/8-16
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That should work as long as they're both 3/8-16
Sorry to sound a dope but could you explain the 3/8-16?
Here's my plan - Summit have finally replied, they will swap the unit for me if I pay the shipping. There lies the problem. It's $100 each way. I'm hoping they can send me a new resevoir with the correct outlets and I swap them over in the UK. That's the only thing I can see thats different between the one they sent and the one I need.
Andy
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Sorry to sound a dope but could you explain the 3/8-16?
The only bad question is the one that never got asked. :)
3/8-16 is talking about the diameter and threads per inch of a US (not metric) fastener.
3/8 is referring to the diameter
and
16 (threads per inch) lets us know that it's a course thread
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And that makes it UNC not UNF? Or is that a term we use in Europe!
Cheers Firefighter, makes perfect sense now ;D
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And that makes it UNC not UNF? Or is that a term we use in Europe!
Yes sir, you are correct.
UNC = Unified National Course and in this case it would be 3/8-16
UNF = Unified National Fine and in this case it would be 3/8-24
Cheers friend !!
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By jove, I think I've got it!!
Just waiting on Summit now. Hoping it'll bolt straight over!
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Sorry Andy, last week with Valentines on Tuesday, Liz' Birthday on Wednesday and my mothers Birthday on Thursday not counting the Liz' pick Friday Dinner and Saturday's non Family Birthday for Liz, I was slightly distracted...
Let me know what you fin from Summit... If I find what you need, and I can ship it like the wheel, it should be cheap right?
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No probs Chris, I know I put a lot on ya when I know yr a busy man, and rightly so family come 1st.
I'll see what summit have to say and go from there.
Cheers all, I'll update soon hopefully!!
Andy
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One step forward and two steps back.
Summit are now being quite helpful but it doesn't seem to be getting anywhere.
Can anyone shed any light after looking at the two pics I've uploaded??
Starting to lose the will to live now!!
Cheers all
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Ok, you need everything that bolts to the firewall... I wish you were closer, I have one complete sitting on a shelf and I can't remember if the power booster has the bracket bolted or a part of it.
Zeig85
If it fits I'd make a bracket it I had to!! Would you be able to get any part number off it so I could match it up? Thats assuming it has the bigger holes as the pics above!!
yours sincerely
Mr Desperate!
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What are you showing/asking in the picture?
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Chris- it should be pics of handfulls of hair!!
The top pic shows the "in transit" bolt that I took out the new master cylinder against the size of fitment I need.
The 2nd pic shows the diameter of what I have. After re-reading Vile's post I gather it's 7/16-18.
Where do I find a master cylinder with that size outlets? And then fingers crossed it marrys up to the new booster I have.
Andy
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Bitzer,
I was referring to the pedal rod not the brake tubing. I'm not quite sure what you are asking?
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Ok, you need everything that bolts to the firewall... I wish you were closer, I have one complete sitting on a shelf and I can't remember if the power booster has the bracket bolted or a part of it.
Zeig85
If it fits I'd make a bracket it I had to!! Would you be able to get any part number off it so I could match it up? Thats assuming it has the bigger holes as the pics above!!
yours sincerely
Mr Desperate!
Mr Desperate, maybe a bit late on the reply, I apologize. Welcome to my other shed.... Anyway the bracket is part of the booster on mine taken from a 1985 C20 Suburban which had the full float rear end and a 454 which I am under the assumption that it is as heavy duty brakes available on a 3/4 ton. Here is some pictures anyway. I was saving it because it was in really nice shape in case I wanted to put power brakes on my C10 project I have in a holding pattern. Please excuse the messy shed, it is going to get cleaned as soon as the weather breaks for good...
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Ah, Yours should be the JB7 (Vacuum booster)
This is the booster/MC combo ($166.00 but not available right now)
http://napaonline.com/Catalog/CatalogItemDetail.aspx?A=NBB501023_0330193855&An=0&Ar=AND(P_RecType%3aA)
This is the MC ($46) Thread size is: 1/2"-20 and 9/16"-18
http://napaonline.com/Catalog/CatalogItemDetail.aspx?A=NMAM2085_0306698566&An=0&Ar=AND(P_RecType%3aA)
This is the Booster: ($110)
http://napaonline.com/Catalog/CatalogItemDetail.aspx?A=NBB5471008_0330193854&An=0&Ar=AND(P_RecType%3aA)
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Sorry Vile I've confused everybody - including myself!
I have a new booster/master cylinder/resevoir complete.
I need to get the connecting rod to the pedal, hoping the Summit kit will sort that.
The resevoir they supplied has 4x 3/8-16 outlets. I need a resevoir with 2x 7/16 outlets, then I have to pray the correct resevoir fits the new booster.
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Measure the bore size for the MC to Booster size and have them confirm.
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from Summit tech page info bit - Master Cylinder Bore Size 1.000 in.
I've tried the NAPA links but they all come up "error" haha
Could you have another peak and see if its the same?
ta mate
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Zeig, what's the adapter looking bit on the back outlet?
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Zeig, what's the adapter looking bit on the back outlet?
Electric brake controller, old style which now I think is not legal. The smaller line went inside the cab to the controller. Now they use a pendulum to control the intensity, or at least that is what I am lead to believe.
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Weird. They don't work...
changed them, do they work now?
JB7
Brake Master Cylinder Bore Size : 1.125"
Brake Master Cylinder Line Thread Size : 1/2"-20, 9/16"-18
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Nope Chris, they still don't work.
Looks like the booster I have is no good, bore too small.
I'm going to bed, nearly midnight and head is cooked!
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email me Andy...