73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: SinisterC10 on November 22, 2016, 04:03:44 pm
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I have a 1981 2wd truck and am wanting to know what bore size the master cylinder and brake booster is? I don't have the ID sticker in my glove box so I can't look it up. I'm going with 4 way Wilwood discs and want to replace the old booster and master.
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in 81 the sticker is on the drivers side inner fender well under the hood.
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in 81 the sticker is on the drivers side inner fender well under the hood.
Mine is missing.
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The forth digit (letter) tells you what brakes you have
http://www.73-87.com/7387info/8187vin.htm
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The forth digit (letter) tells you what brakes you have
http://www.73-87.com/7387info/8187vin.htm
My vin has a "D", but that's not going to tell me what bore sizethe MC is. I took a dial caliper and the inside bore measures about 40mm or 1.57". I still need to know if this is considered a jb3 or jb5 system.
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http://forum.73-87chevytrucks.com/smforum/index.php?topic=28592.0
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The forth digit (letter) tells you what brakes you have
http://www.73-87.com/7387info/8187vin.htm
My vin has a "D", but that's not going to tell me what bore sizethe MC is. I took a dial caliper and the inside bore measures about 40mm or 1.57". I still need to know if this is considered a jb3 or jb5 system.
JB3 will have 1" rotors and JB5 will have 1.25" rotors, both share the same master cylinder it seems.
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jb 1 had the 1.417" bore while jb 3 and 5 had the 1.574"
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Thanks for the info guys. I've decided to put a Hydratech Hydroboost system in the truck. I have one that I had on my Camaro and am going to have Hydratech change out the mounting plate and pedal rod. Gonna cost me about $275.