# Brakes

**URL:** <https://community.cartalk.com/t/brakes/47476>\
**Category:** Maintenance/Repairs\
**Tags:** cylinder, chevrolet, 1500\
**Created:** [April 15, 2010, 12:34am UTC](https://community.cartalk.com/t/brakes/47476 "2010-04-15T00:34:49Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![toadfax](https://avatars.discourse-cdn.com/v4/letter/t/edb3f5/32.png) [@toadfax](https://community.cartalk.com/u/toadfax)\
**Post date:** [April 15, 2010, 12:34am UTC](https://community.cartalk.com/t/brakes/47476/1 "2010-04-15T00:34:49Z")

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My brake pedal is making a hissing noise. I checked my brake fluid, thinking I might be low; but it was fine. Is my master cylinder going bad??

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [April 15, 2010, 12:38am UTC](https://community.cartalk.com/t/brakes/47476/2 "2010-04-15T00:38:58Z")

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It sounds like you have a hole in the diaphragm of your brake booster ( the large round canister your master cylinder is bolted to. )

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**Author:** ![toadfax](https://avatars.discourse-cdn.com/v4/letter/t/edb3f5/32.png) [@toadfax](https://community.cartalk.com/u/toadfax)\
**Post date:** [April 15, 2010, 12:43am UTC](https://community.cartalk.com/t/brakes/47476/3 "2010-04-15T00:43:59Z")

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How much am I looking at in repairs?

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**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/30_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\
**Post date:** [April 15, 2010, 6:24am UTC](https://community.cartalk.com/t/brakes/47476/4 "2010-04-15T06:24:53Z")

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I agree that the brake booster is probably leaking.  
Depending upon the region where you live, replacement will probably cost anywhere from about $250 to $300 for parts & labor.

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [April 15, 2010, 6:21pm UTC](https://community.cartalk.com/t/brakes/47476/5 "2010-04-15T18:21:49Z")

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Agreed. That’s with a remanufactured booster, which is perfectly fine to use.