Brake piston seal kit

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Speed Freak
Posts: 26
Joined: Fri Apr 18, 2014 8:17 am
Location: Spielberg (Austria)

Brake piston seal kit

#1 Post by Speed Freak » Mon Jun 27, 2016 5:22 pm

Hi,

I was wondering if i need a special seal kit for my 1985 RD350 (31K with needle swing arm bearings) front and rear brake caliper.
There are a lot of kits for 1983-1984 but nothing for 1985.

Did they change the brakes in 1985?

Found this numbers in the Yamaha parts catalogue for 1985:
51L-W0047-00 (same for all 3 calipers), bit 40€ for each set is quite expensive for 4 rubber rings...

Does anyone know a part number (also other brands) for the seal between the 2 parts of every brake caliper?
From the RD500 I know that Yamaha doesn`t sell this seal but I want to split them up for cleaning and painting and replace the seal later.
My Bikes:
Yamaha RD500 1985
Yamaha RD350 1985
Yamaha R1 2001
Honda CBR 1000 2006

justind97
Posts: 202
Joined: Mon Aug 10, 2015 8:57 pm
Location: Ottawa, Canada

Re: Brake piston seal kit

#2 Post by justind97 » Mon Jun 27, 2016 8:43 pm

For the seals between the caliper halves, there's a company on eBay out of England. Powerhouse-UK

There's different sizes, measure yours before ordering

Speed Freak
Posts: 26
Joined: Fri Apr 18, 2014 8:17 am
Location: Spielberg (Austria)

Re: Brake piston seal kit

#3 Post by Speed Freak » Tue Jun 28, 2016 4:06 am

Thanks for your answer.
I will disassemble them during the next days/evenings.

Did some research yesterday evening.
31K 83/84 brake calipers have just one piston, from 85 to the end of production they have 2 pistons per caliper.
They also need different brake pads.

Found this one:
http://www.2takte.de/product_info.php?i ... bj-85.html" onclick="window.open(this.href);return false;

I just don`t need the pistons...
But if the seals are from Yamaha as shown on the picture maybe worth the money (80€ only for the seals from the Yamaha dealer)
My Bikes:
Yamaha RD500 1985
Yamaha RD350 1985
Yamaha R1 2001
Honda CBR 1000 2006

MK
Posts: 814
Joined: Sat Nov 26, 2005 11:44 am
Location: Wolfenbüttel, Germany
Contact:

Re: Brake piston seal kit

#4 Post by MK » Tue Jun 28, 2016 5:59 am

Yes, the 85 31K has the front brakes of the later 1WW models.
Not 100% sure about the rear.
Bye
Martin

Speed Freak
Posts: 26
Joined: Fri Apr 18, 2014 8:17 am
Location: Spielberg (Austria)

Re: Brake piston seal kit

#5 Post by Speed Freak » Tue Jun 28, 2016 10:04 am

By the way, which paint do you use to get the original finish of the brake calipers?
Maybe a bit more resistant than the original.

Was thinking about thin epoxy based powder coating.
Doesn`t need to be perfect, the 350 is just my daily driver.
My Bikes:
Yamaha RD500 1985
Yamaha RD350 1985
Yamaha R1 2001
Honda CBR 1000 2006

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