SOHC.co.uk Forums > CB500/550
Brake calliper silicone grease
K2-K6:
For the seals, I put them in using silicone grease (this seems contentious though) after thoroughly cleaning the the seal groove.
On anything I've completed though it has been long lasting and the most successful I've yet found.
I disagree with using brake fluid, it obviously works, and with zero risk as recommendations go, but favoured silicone grease specifically for the protection against corrosion longer term.
Everyone will have to form their own opinion as to what they are comfortable with though.
K2-K6:
--- Quote from: McCabe-Thiele (Ted) on February 19, 2024, 05:11:28 PM ---
--- Quote from: b_1_rd on February 19, 2024, 05:09:14 PM ---Wow thanks all that’s great information.
Amazing amount of info, thanks K2-K6.
I’ve ordered some other silicone grease (NLGI 2 grade) just to be safe and will just use the existing tin for general purpose stuff.
What’s the recommendation for the seal? Leave it clean and dry or smear brake fluid etc?
Thanks again.
--- End quote ---
Back in the day most car wheel cylinder kits all came with a small sachet of red lubricant - I always assumed it was red rubber grease.
--- End quote ---
Yes I remember those Ted and one of my first trusted tasks given to me by my dad. A little sachet to squeeze onto the components within car wheel cylinders when changing pistons/seals. Brakes always seemed to be quite marginal on cars from my early memories :) with drums all found on old BMC stuff.
A little square spanner too for adjustment of shoes when the drum was back in place, a little ritual of maintaining them.
Also gapping the spark plugs as the earth electrode wore down, by tap, tap, tapping it on the rocker cover bolt of A series BMC motor. I felt really important given that responsibility and with a set of feeler gauges to work with ;D
b_1_rd:
Brill. Thanks everyone. :)
ST1100:
--- Quote from: deltarider on February 19, 2024, 11:07:26 AM ---Ate grease is - or used to be - first choice and was used by professional mecs. The tube says: compatible with: brake fluids DOT 3, DOT 4 and DOT 5.1. It's expensive though, so I wonder what alternatives there are. Some suggest you may use vaseline just as well. I don't know about the latter.
But that Ate grease is made for the brake job and therefore 100% safe.
--- End quote ---
Second that, using it for all MC and SC overhauls, brakes or clutch...
K2-K6:
There's some general restrictions on usage of different product.
Petroleum based ( vaseline etc) you'd not use unless specifically demanded by manufacturer direction, unlikely in what I've seen.
The ATE paste for assembley, appears to have the same properties as traditional red rubber grease in its directions, notably it's not compatible with silicone fluids, if anyone was to think about that combination. Red rubber grease is I understand vegetable oil based
Excerpt from ATE published directions in regard to THAT ATE product noted above.
"ATE brake cylinder paste
The brake cylinder paste is used for the repair, assembly
and corrosion preservation of internal brake components.
Its lubricity also enhances ease of fitting, especially of
rubber parts on metal surfaces.
The brake cylinder paste is not splashwaterproof. Its use
is therefore restricted to internal surfaces in protected or
sealed installation positions.
The brake cylinder paste is used for hydraulic brake
systems designed for operation with brake fluid based
on polyglycol ethers according to the standards FMVSS
116 (DOT 3, DOT 4, DOT 5.1), SAE J1703 and DIN ISO
4925. It is not planned for usage in brake systems with
a silicone or mineral oil based hydraulic fluid.
Although, as a rule, plastic components (such as pis￾tons) which are resistant to brake fluid are also resistant
to the brake cylinder paste, the compatibility of plastics
with brake cylinder paste must be tested. The same
applies to organic coatings.
The brake cylinder paste must be kept away from the
surfaces of friction linings or brake discs.
The paste has a long-term temperature stability ranging
from -40° C/ –40° F to 100° C/212° F and temporarily
resists temperatures up to approx. 200° C/392° F.
The brake cylinder paste is available in
3 consistencies:
Consistency Container Item code
pasty 180 g tube 03.9902-05xx.2
soft 5 kg bucket 03.9902-0503.2
40 kg bucket 03.9902-0504.2
free-flowing 5 kg bucket 03.9902-0505.2
40 kg bucket 03.9902-0506.2
The brake cylinder paste is not a lubricating grease with
a stable consistency. Under the influence of mechanical￾dynamic processes, such as flowing and stirring, an
increasing reduction of consistency occurs which disap￾pears again when the process ends. Thus, the specifi￾cation of a defined viscosity value is not reasonable.
Above approx. 70° C/158° F an increasing liquefaction
of the thickener sets in which is almost reversible on
cooling down.
Specific values:
n Dropping point for pasty tube quality (DIN ISO 2176):
<80° C/176° F
n Flash point of base oil (DIN EN ISO 2719):
>145° C/293° F
n Low-temperature stability (all consistencies)
after storage at –30° C/ –22° F for 1 week:
soft, brushable
after storage at –40° C/ –40° F for 24 h: not solid
n Swelling of rubber (DIN ISO 4925 Item 5.11, determined
on SBR test cup seal RM-3a, 70 h/100° C/212° F):
Change in volume: 0 to +6%
Change in hardness: 0 to –10 IRHD
The brake cylinder paste shall be applied as a thin,
uniform film or in dots applied by means of an automatic
lubricating system.
Contact of the brake cylinder paste with friction lining
surfaces and brake discs must be avoided.
n Shelf life (information for a storage temperature from
0° C/32° F to +40° C/104° F):
Tubes: 3 years
Buckets: 2 years
When not in use, the container must be kept tightly
sealed.
During storage and transport of the paste, changes
of consistency (rigidification) or partial separation may
occur, especially when the maximum storage tempera￾ture is exceeded. This behaviour, however, does not
adversely affect the usabilty of the paste. A consistency
which permits the usage of the paste can be reestab￾lished by mechanical treatment of the paste (e.g. agitat￾ing), if necessary by additional warming to a maximum
temperature of +40° C/104° F.
On agitating, it has to be made sure that no particles,
e.g. from the container, from the agitating tool or by
exterior contamination get into the paste which may
adversely affect braking components on application of
the paste.
A Safety Data Sheet as well as additional information
regarding this topic are available under www.ate.de."
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