do i need a master cylinder?

t1bmxrder · 11-20-2006, 09:41 AM

well my brakes work but there weird cause if i were to press the pedal hard then there work fine but if i were press there slowly there they sink to the floor. i have bleed the brakes and it kinda helped so i was asking some of the mechanics at work and they say i might need a master cylinder. its an 86

jerzefigga · 11-20-2006, 02:08 PM

is it the original MC? if so how many miles on it?

t1bmxrder · 11-20-2006, 02:32 PM

i dont know if its the original, the car has over 185000 miles.

Acet · 11-20-2006, 04:58 PM

I would say change it and see if it works. I mean its only $50ish and you'll not have to worry about it for a long time.

Gairloch · 11-20-2006, 11:28 PM

Yes, that's probably your MC.

jlantz85 · 11-21-2006, 12:36 AM

i think its the mc, you can push your brake pedal firmly but not all the way to the floor and hold it, if it starts sinking to the floor thats definitly your problem

t1bmxrder · 11-21-2006, 08:08 AM

thanks i will look into buying one soon before it snows. i dont have to completely remove all the brake fluid to change it? can i just swap it put some new fluid in the reservoir and bleed it?

Acet · 11-21-2006, 11:27 AM

If you're gonna put in a new MC in, you might as well bleed it all out and get new fluid.

Gairloch · 11-23-2006, 01:30 AM

You can save yourself a lot of headache if you bench bleed the MC before you install it.

How to:http://www.superchevy.com/technical/.../0509sc_bench/

I use a turkey baster to suck most of the fluid out of the reservoir before cracking open the system. Make sure that you've got a nice layer of shop rags all under your MC and attached lines otherwise you're likely to get brake fluid all over your frunk paint.

AustinTxMR2 · 11-25-2006, 06:53 AM

Quote:

Originally Posted by t1bmxrder

I dont have to completely remove all the brake fluid to change it?

New brake fluid is a good thing! Brake fluid draws moisture out of the air very easily and quickly and that translates to a brake system that is destroyed by rust and corrosion. If you have no idea how old the fluid is than don't hesitate to change it. Brake fluid is cheap too! Bench bleeding is a must, it can be difficult if not impossible to get all the air out if you don't because the MC is not always mounted level on a firewall and that can cause bubbles to be trapped. John

11-20-2006, 09:41 AM	#1 (permalink)
t1bmxrder R.I.P DIRTWOOD Join Date: Nov 2005 Location: pawtucket, rhode island Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	do i need a master cylinder? well my brakes work but there weird cause if i were to press the pedal hard then there work fine but if i were press there slowly there they sink to the floor. i have bleed the brakes and it kinda helped so i was asking some of the mechanics at work and they say i might need a master cylinder. its an 86

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11-20-2006, 02:08 PM	#2 (permalink)
jerzefigga Cage Fighter Join Date: Apr 2005 Location: Chicago/NJ/CA Posts: 357 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (3/100% )	is it the original MC? if so how many miles on it?

11-20-2006, 02:32 PM	#3 (permalink)
t1bmxrder R.I.P DIRTWOOD Join Date: Nov 2005 Location: pawtucket, rhode island Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	i dont know if its the original, the car has over 185000 miles.

11-20-2006, 04:58 PM	#4 (permalink)
Acet Banned Join Date: Dec 2005 Location: alpharetta,ga Posts: 440 Thanks: 5 Thanked 7 Times in 7 Posts iTrader Rating: (1/100% )	I would say change it and see if it works. I mean its only $50ish and you'll not have to worry about it for a long time.

11-20-2006, 11:28 PM	#5 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	Yes, that's probably your MC.

11-21-2006, 12:36 AM	#6 (permalink)
jlantz85 diesel skills Join Date: Feb 2006 Location: Clayton, Indiana Posts: 225 Thanks: 0 Thanked 6 Times in 6 Posts My Google Map iTrader Rating: (0/0% )	i think its the mc, you can push your brake pedal firmly but not all the way to the floor and hold it, if it starts sinking to the floor thats definitly your problem

11-21-2006, 08:08 AM	#7 (permalink)
t1bmxrder R.I.P DIRTWOOD Join Date: Nov 2005 Location: pawtucket, rhode island Posts: 34 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	thanks i will look into buying one soon before it snows. i dont have to completely remove all the brake fluid to change it? can i just swap it put some new fluid in the reservoir and bleed it?

11-21-2006, 11:27 AM	#8 (permalink)
Acet Banned Join Date: Dec 2005 Location: alpharetta,ga Posts: 440 Thanks: 5 Thanked 7 Times in 7 Posts iTrader Rating: (1/100% )	If you're gonna put in a new MC in, you might as well bleed it all out and get new fluid.

11-23-2006, 01:30 AM	#9 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 5,313 Thanks: 139 Thanked 296 Times in 264 Posts Blog Entries: 4 My Google Map iTrader Rating: (7/100% )	You can save yourself a lot of headache if you bench bleed the MC before you install it. How to:http://www.superchevy.com/technical/.../0509sc_bench/ I use a turkey baster to suck most of the fluid out of the reservoir before cracking open the system. Make sure that you've got a nice layer of shop rags all under your MC and attached lines otherwise you're likely to get brake fluid all over your frunk paint.