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brake booster difference

drewballs

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was wondering if anyone can tell me what the difference is looks wise between a single diaphragm brake booster n a double diaphragm brake booster is as i bought a brake booster from a vq v8 statesman and cant tell the difference between that one and the one thats already on my vn s pack
 

Shearer

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Single diaphragm has a smooth body
Double diaphragm has several lumps on it
 

stockies

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Also has a different bracket on it. (the master cylinder part)
Also has a part number stamped into the bottom. My original 15/16" one did not.



Also, some S packs had a 1" master and duel booster as standard.
 
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