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Post subject: brake caliper pistonhelp needed
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yamanastic  Suburban Commuter Joined: 19 Nov 2004 Total posts: 97 Location: CARNMONEY, CO ANTRIM, NI. |
Hi all I'm fitting new pistons to my brake calipers on 350lc, I've never done this before so a bit unsure of how tight the new piston is when going back into the calipers. I have used new seals and all genuine parts, so what I need to know is,
1. when replacing the piston do you use the red grease provided in the kit or clean brake fluid as a lubricant?
2. how tight should the piston be when it is being fitted into the caliper?
cheers all...
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Posted: Sat May 10, 2008 12:48 pm
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Drewski Ace of Spades Joined: 29 Apr 2006 Total posts: 4893 Location: The Bunker,Cambridge, UK |
Brake fluid, if you've cleaned out the recesses for the seals, piston should move in and out freely with a bit of pressure.
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Posted: Sat May 10, 2008 2:06 pm
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Shytalk Regular Racer Joined: 13 May 2005 Total posts: 310 Location: Staffordshire |
Personal choice TBH, I use the red rubber grease as thats what its supplied for, the piston can be quite a tight fit with new seals in, should push in easily enough with a bit of pressure but won't always pull back out by hand.
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Posted: Sat May 10, 2008 3:22 pm
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yamanasticSuburban Commuter Joined: 19 Nov 2004 Total posts: 97 Location: CARNMONEY, CO ANTRIM, NI. |
Cheers lads tried one piston and it was very tight and when I tried to get it back out again it wouldn't move, so in my wisdom I went at it with the vice grips and low and behold marked the thing. You live and learn but sometimes the hard and expensive way.
Thanks...
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Posted: Sat May 10, 2008 4:16 pm
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| booga Joined: 10 Feb 2004 Total posts: 7698 |
I always use the supplied red grease.
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Posted: Sat May 10, 2008 5:42 pm
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jante350 RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5129 Location: Bergen, Norway |
The red grease, you bleed the excess grease out after fitting. The pistons should slide in by using handforce, but it might need alot of hand force. If you use vice grips, put a piece of cloth between it and the piston...
Best way to get them out is to pump with the master cylinder...
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Posted: Sat May 10, 2008 7:19 pm
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Vindaloobeast Rear-wheel Steering! Joined: 25 Aug 2005 Total posts: 2609 Location: Gloucester |
| jante350 wrote: |
The red grease, you bleed the excess grease out after fitting. The pistons should slide in by using handforce, but it might need alot of hand force. If you use vice grips, put a piece of cloth between it and the piston...
Best way to get them out is to pump with the master cylinder... |
I have always used brake fluid. The grease is an option but you'll find most pro's use fluid too. Never had a problem. I do know from personal and painful experience that the LC ones are dead tight. I replaced mine years ago and I couldn't get the buggers out so I went to see my mate who has an airline with a fine nozzle. Im stood there holding the calliper with my fingers between the pistons and he fired the airline..
How on earth I never lost my finger tips I will never know. Pistons came out alright though...! Fingers were purple and black for a period of about a month.
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Posted: Sat May 10, 2008 7:31 pm
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oldsteve1963 Daily Burner Joined: 20 Feb 2007 Total posts: 235 Location: Hull England |
Or it flys across the garage somewhere 
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Posted: Sat May 10, 2008 10:14 pm
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whitelcDaily Burner Joined: 16 Aug 2003 Total posts: 146 Location: Jyväskylä, Finland |
wrapping the damn thing in a towel stops the compressed air driven missile. Mine went in easy enough with brake grease,no power required at all. I used a soft brass brush to remove the crud from the grooves before fitting the seals..
I tried my lc250 on thursday and either the original 25 yrs old pads are not up to date or 1 disc is waay too little. It's nothing like my twin disc 31k after a rebuild so new pads going in. If it doesn't help it's another disc.
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Posted: Sun May 11, 2008 7:26 am
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