Break arm spring Vespa Sprint
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Enthusiast
Joined: 21 Jun 2016
Posts: 67
Location: Finland
Sat Aug 10, 2019 7:44 am quote
I have a hard time figuring out how to asseble the spring on the arm? What is the purpose of this spring?

IMG_5392.JPG

Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4761
Location: So Cal
Sat Aug 10, 2019 8:36 am quote
Are you referring to this?

12194658-B8EF-421E-927A-F90439F6343F.jpeg

Enthusiast
Joined: 21 Jun 2016
Posts: 67
Location: Finland
Sat Aug 10, 2019 8:43 am quote
It is the rear break arm. Your looks like the front break arm?
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4761
Location: So Cal
Sat Aug 10, 2019 9:10 am quote
Are you sure it goes on the rear brake? It isnít on any of my bikes and I donít see it in any parts books. The only spring that goes on the rear brake is a small spring that retains the shoes.
Addicted
GL, PK, PE200
Joined: 24 Apr 2012
Posts: 640
Location: Deep in the heart of Texas
Sat Aug 10, 2019 11:11 am quote
That spring just provide tension for the brake arm when pulled or the brake pressed. The spring brings back the arm to it's normal position. Just slip over cam until touching motor and clip other end over the arm.

Good luck!

Edit to add better installation illustration from Scooter Mercato: http://www.scootermercato.com/Garage/Tech-Tips/Engine-Assembly-Part-2-Large-Frame

brakearmspring.jpg



Last edited by rowdyc on Sat Aug 10, 2019 11:40 am; edited 1 time in total
Ossessionato
1976 Super (x 2), 1974 Primavera (x 2), 2006 Fly 150
Joined: 26 Sep 2013
Posts: 4761
Location: So Cal
Sat Aug 10, 2019 11:22 am quote
Well lookie there... do all Sprints have one? Never seen it before. Nice one rowdy!
Enthusiast
Joined: 21 Jun 2016
Posts: 67
Location: Finland
Sat Aug 10, 2019 11:58 am quote
Thanks!!
Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and new to 2018, '66 Blue Badge Smallframe
Joined: 30 Nov 2011
Posts: 6950
Location: Victoria, Australia
Sat Aug 10, 2019 3:03 pm quote
SoCalGuy wrote:
Well lookie there... do all Sprints have one? Never seen it before. Nice one rowdy!
Odd, I've never seen a motor witout one.
Enthusiast
Joined: 21 Jun 2016
Posts: 67
Location: Finland
Sun Aug 11, 2019 12:58 am quote
Iīm missing the front spring. Does all models have one?
Enthusiast
Joined: 21 Jun 2016
Posts: 67
Location: Finland
Sun Aug 11, 2019 6:05 am quote
Is there a cotter pin or something keeping the axle in correct position?
Addicted
GL, PK, PE200
Joined: 24 Apr 2012
Posts: 640
Location: Deep in the heart of Texas
Sun Aug 11, 2019 6:39 am quote
Don't understand the front spring question. Are you referencing the spring that holds the brake shoes? All models have a spring for brake shoes.

Don't understand the "axle" question. The axle is coming from the inside of the motor and hold the gears. If you're referring to the cam, it is held on with a circlip.

The Scooter Mercato photo's in the link above show everything needed for reinstalling the rear brakes and more. All vespa rear brake installs on the motor are mostly the same.
Veni, Vidi, Posti
74 50s x2 78 P200 84 Cosa 58 AllState 68 Sprint 80 50special + projects
Joined: 22 Nov 2010
Posts: 6996
Location: seattle/athens
Sun Aug 11, 2019 3:32 pm quote
Frankieboy wrote:
Is there a cotter pin or something keeping the axle in correct position?
Yeah, you mean the brake cam shaft and you're right, it's held in with a long skinny cotter pin. It goes between the spring and the shaft lever, see the hole? The cotter pin is kind of buried and can be a pisser to find, never mind getting it out. I just removed one so I went and got a pic.

Some newer Vespas also have a similar spring on the front brake. I don't know about largeframes, but my '80 smallframe does.

brake cam.jpg
See the smaller hole right of the axle hole?
Stack up the lever and spring behind and push the cam shaft into them thru the hole from the top.
Add cotter pin & done.

Hooked
'63 VBB2T - '18 300 GTS Super Notte
Joined: 26 Apr 2019
Posts: 149
Location: Belgium
Mon Aug 12, 2019 9:22 am quote
My VBB has one too (don't look at the oil )

IMG_7511.jpg

Molto Verboso
2018 GTS300 Super Sport - Donatello Vespace
Joined: 22 Dec 2012
Posts: 1173
Location: Toronto, Ontario Canada
Mon Aug 12, 2019 9:46 am quote
Yikes! I thought someone got injured
Isnt it supposed to be "brake arm spring"?
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