| Brake Caliper Grease | |
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Loosemarbles Site Admin
Number of posts : 1553 Age : 62 Location : South East England Points : 4463 Registration date : 2016-10-01
| Subject: Brake Caliper Grease Mon Apr 24, 2023 3:57 pm | |
| I'm having one of my 'get it right you fool' moments.
Last time I rebuilt my rear brake caliper I think I made a bit a hash of it, mainly to do with 'sticky' pistons. I don't recall using the little pack of grease which came with the kit.
Having Googled some tips, I can't see anybody using the grease to rebuild brake calipers. Most people say that using fluid to install the pistons will lubricate them. I am wondering which parts should be applied with 'brake fluid' and which parts with 'grease'? The inner seal in the bore is obviously a fluid seal. The outer seal is a dust cover but does it also act a grease seal to stop the fluid and grease mixing?
If so, it means coating the pistons and bores with great dexterity. Have I missed something?
....bearing in mind that my Marbles are already loose. |
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JohnyC Super Scooter Rider
Number of posts : 291 Age : 71 Location : Bristol, UK Points : 761 Registration date : 2022-12-23
| Subject: Re: Brake Caliper Grease Mon Apr 24, 2023 4:59 pm | |
| Hi Chris. As you might be aware, I re-ferbed my Front and Rear calipers recently using Stainless Steel pistons in a hope that the salt won't stick to them. I also clean the piston bore with a white scotch pad(non scratch) because the crud gets in under the seals, I made a special scrapper to scrape the seal grooves because of the corrosion build up in the bottom. I always use the red grease to seat the dust and piston seals in the caliper then a smear of Dot 4 on the pistons to push them into the calipers. My rule of thumb is.... if you can push the pistons in but can't pull them back out with just your fingers there's still crap in the seal groves causing them to bind on the piston Then bleed and test for binding, the usual faffing.
Hope this helps.
Be safe, be seen! |
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P-21179 Scooter Rider
Number of posts : 13 Location : sweden Points : 585 Registration date : 2022-09-06
| Subject: Re: Brake Caliper Grease Tue Apr 25, 2023 5:21 am | |
| Hello I usually wash my brake stuff in ethanol alcohol scrape the piston packing groove with a home-made special tool polish with fine sanding cloth, lubricate pistons and cylinder inside with the red brake grease from ATE + a little inside on dust seal before assembly bleed with the cheapest suction brake breather on aliexpress and thanks to this super forum my glue clamps on brake handles held for 24 hours = super brakes |
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Loosemarbles Site Admin
Number of posts : 1553 Age : 62 Location : South East England Points : 4463 Registration date : 2016-10-01
| Subject: Re: Brake Caliper Grease Tue Apr 25, 2023 10:07 am | |
| Sounds logical but if there is red grease on the bore seals, does it have a nasty reaction with the brake fluid when you insert the pistons?
I'd be interested to see your bore groove cleaners. |
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P-21179 Scooter Rider
Number of posts : 13 Location : sweden Points : 585 Registration date : 2022-09-06
| Subject: Re: Brake Caliper Grease Tue Apr 25, 2023 10:15 am | |
| one of the tools is made of 2mm welding wire with a 180 degree bend the other is a leftover sheet metal strip with a 90 degree bend unfortunately can't post any pictures, guess have to go to training for that Stefan |
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GHM-PM Site Admin
Number of posts : 2540 Age : 71 Location : Bullhead City, AZ Points : 7176 Registration date : 2012-05-17
| Subject: Re: Brake Caliper Grease Tue Apr 25, 2023 8:50 pm | |
| Just for information this topic was in "Introductions" so I moved it over to "Maintenance". Carry on!!! |
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Loosemarbles Site Admin
Number of posts : 1553 Age : 62 Location : South East England Points : 4463 Registration date : 2016-10-01
| Subject: Re: Brake Caliper Grease Wed Apr 26, 2023 1:31 am | |
| Thanks Glenn. That'll be me not paying attention again. |
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Loosemarbles Site Admin
Number of posts : 1553 Age : 62 Location : South East England Points : 4463 Registration date : 2016-10-01
| Subject: Re: Brake Caliper Grease Wed Apr 26, 2023 12:05 pm | |
| I've dismantled my used rear brake caliper and it all seems to be in good condition. I've removed some crud from the pistons using Autosol Metal Polish. They look like stainless steel pistons; After doing some Googling I can't decide what to 'wash' them with to remove traces of metal polish. Any recommendations welcome, particularly if you've ever done this. |
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JohnyC Super Scooter Rider
Number of posts : 291 Age : 71 Location : Bristol, UK Points : 761 Registration date : 2022-12-23
| Subject: Re: Brake Caliper Grease Wed Apr 26, 2023 1:31 pm | |
| Hi Chris. The thickness of the side wall of the piston tells me It's Stainless.
Firstly, don't forget to clean the bottoms of the seal grooves in the caliper.
I just use a rattle can of brake cleaner to clean the sight window and to remove any possible residues then wipe off with kitchen towel or leave to self dry where applicable.
Hope this helps.
Be safe, be seen! |
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steve_h80 Silver Wing Expert
Number of posts : 993 Location : Teesdale, UK Points : 3947 Registration date : 2016-05-15
| Subject: Re: Brake Caliper Grease Thu Apr 27, 2023 2:41 am | |
| Just put all the parts in the dishwasher. What could possibly go wrong? |
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Loosemarbles Site Admin
Number of posts : 1553 Age : 62 Location : South East England Points : 4463 Registration date : 2016-10-01
| Subject: Re: Brake Caliper Grease Fri Apr 28, 2023 2:45 pm | |
| Ha! You may jest my friend but after all the manual labour involved in this job, the thought had occurred! |
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| Brake Caliper Grease | |
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