Hawk master cylinder sticking

Ac21 · 08-11-2018, 01:01 AM

Anyone know how I can get the front brake master cylinder free again it's not coming out anymore to activate the brake light switch. I already pulled the boot off and sprayed lube in it but didn't help.

pete · 08-11-2018, 03:21 AM

Is the brake locked on ?

have you tryed losening the lever pivot bolt ?
have you removed the lever to see if the piston returns ?

.

Ac21 · 08-11-2018, 08:17 AM

The lever is not the issue. Inside the master cylinder there's a spring it seems to be weak.

pete · 08-11-2018, 08:36 AM

Quote:

Originally Posted by Ac21

The lever is not the issue. Inside the master cylinder there's a spring it seems to be weak.

Stretch the spring so it's a bit longer...

Emerikol · 08-11-2018, 08:55 AM

If you live near a home depot or lowe's, they have a whole bunch of springs in the hardware aisle. They're in pull out sliding boxes where the nuts and bolts are. I would take your old spring with you, and then go try to find something that's slightly stiffer. Also, make sure that it's stainless steel so it doesn't rust and plug up the important bits. Failing all that, you can just get a longer banjo bolt and put in a pressure switch for the brake light. Let us know how it turns out.

Ac21 · 08-11-2018, 10:13 AM

I tore the last seal when i was trying to get it back in, anyone know if this is a standard master cylinder and can i get a rebuild kit at local parts store?

Digger · 08-11-2018, 10:56 AM

Something I found while working on Master cylinders on snowmobiles it is hard to install the piston. What I do is install the seal wrap the seal with an old photo and secure with a nylon ty strap (I think a playing card would work as well) once the seal is compressed put the assembled piston and seal in the freezer and let it freeze for a half hr. Once frozen work quickly remove ty strap and photo. Usually it will slide into the bore without any effort

Ac21 · 08-11-2018, 11:19 AM

i'ma go to the parts places and see if i can find something

Ariel Red Hunter · 08-11-2018, 07:20 PM

Quote:

Originally Posted by Ac21

Anyone know how I can get the front brake master cylinder free again it's not coming out anymore to activate the brake light switch. I already pulled the boot off and sprayed lube in it but didn't help.

Did you change the brake fluid?

Ac21 · 08-11-2018, 08:26 PM

Quote:

Originally Posted by Ariel Red Hunter

Did you change the brake fluid?

absolutely!

i search around and decided to put the torn seal back in and see if it leaked which it didn'd

08-11-2018, 01:01 AM	#1
Ac21 Join Date: Jun 2018 Posts: 54	Hawk master cylinder sticking Anyone know how I can get the front brake master cylinder free again it's not coming out anymore to activate the brake light switch. I already pulled the boot off and sprayed lube in it but didn't help.
	1

08-11-2018, 03:21 AM	#2
pete Join Date: Jan 2012 Location: ChCh , NZ Posts: 2,262	Is the brake locked on ? have you tryed losening the lever pivot bolt ? have you removed the lever to see if the piston returns ? . __________________ 09 XT660R ... 06 TTR250 ... 80 Montesa H6 125 Enduro... 77 Montesa Cota 348 MRR "Malcom Rathnell Replica"... Current resto projects.. 81 Honda CT110... 80 Kawasaki KL250A1... 11 Husaburg TE125 enduro... "sold" along with another 31... Lifan 125 Pitbike.. "stolen" ... KIWI BIKER FORUM...... http://www.kiwibiker.co.nz/forums/content.php All the best offroad rides in NZ... http://www.remotemoto.com/ E-mail... xtpete1@gmail.com
	0

08-11-2018, 08:55 AM	#5
Emerikol Join Date: Oct 2016 Location: Carrollton, GA Posts: 1,465	If you live near a home depot or lowe's, they have a whole bunch of springs in the hardware aisle. They're in pull out sliding boxes where the nuts and bolts are. I would take your old spring with you, and then go try to find something that's slightly stiffer. Also, make sure that it's stainless steel so it doesn't rust and plug up the important bits. Failing all that, you can just get a longer banjo bolt and put in a pressure switch for the brake light. Let us know how it turns out. __________________ First Rule of Aviation: -Never Pass Up The Opportunity to Pee I was struggling to get my wife's attention; I sat down on the couch and looked comfortable. That did the trick! My wife says I only have two faults. I don't listen and something else... If at first you don't succeed, try doing it the way I told you to... The Stable: 2005 Yamaha V-Star 650 - SOLD 2015 Suzuki DR 650 2015 RPS Hawk 250 - SOLD 2016 Ural Gear Up
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08-11-2018, 08:17 AM	#3
Ac21 Join Date: Jun 2018 Posts: 54	The lever is not the issue. Inside the master cylinder there's a spring it seems to be weak.
	0

08-11-2018, 10:13 AM	#6
Ac21 Join Date: Jun 2018 Posts: 54	I tore the last seal when i was trying to get it back in, anyone know if this is a standard master cylinder and can i get a rebuild kit at local parts store?
	0

08-11-2018, 10:56 AM	#7
Digger Join Date: Jul 2018 Posts: 64	Something I found while working on Master cylinders on snowmobiles it is hard to install the piston. What I do is install the seal wrap the seal with an old photo and secure with a nylon ty strap (I think a playing card would work as well) once the seal is compressed put the assembled piston and seal in the freezer and let it freeze for a half hr. Once frozen work quickly remove ty strap and photo. Usually it will slide into the bore without any effort
	1

08-11-2018, 11:19 AM	#8
Ac21 Join Date: Jun 2018 Posts: 54	i'ma go to the parts places and see if i can find something
	0