69 roadster master cylinder, replace or rebuild

Tech tips and how to's

Moderators: notoptoy, garth, S Allen

mdkelsay
Roadster Newby
Posts: 5
Joined: Sat Nov 17, 2018 6:53 pm

69 roadster master cylinder, replace or rebuild

Post by mdkelsay »

Having some brake issues; part of it seems to be due to a potentially faulty master cylinder.

Anyone rebuilt one of these, and if so, hos did it go?

I really don't want to spend $900+ for a new one....

Anyone find a substitute for the stock dual master cylinder?

User avatar
Gregs672000
Roadster Fanatic-Site Supporter
Posts: 6746
Joined: Fri Aug 07, 2009 11:47 pm
Location: Tacoma, WA

Re: 69 roadster master cylinder, replace or rebuild

Post by Gregs672000 »

Yes there are options, however I suggest you do a search of our site as it will explain things better than me doing it again here. If you still have questions or need assistance/clarification, please feel free to ask away!
Welcome!
Greg Burrows
'67 2000 #588
Tacoma, WA

DatsunMan
Forum Newb
Posts: 1
Joined: Sat May 20, 2017 8:46 pm
Location: Wyoming
Model: 2000
Year: High Windshield-68-70

Re: 69 roadster master cylinder, replace or rebuild

Post by DatsunMan »

I have rebuild my master cylinder, bled the brakes and do have brakes. However the peddle travels almost to the bottom before I have brakes. Some people say the master cylinder needs to be replaced. Any Suggestions?

User avatar
notoptoy
Vendor-Site Supporter
Posts: 9083
Joined: Fri Oct 02, 2009 2:55 pm
Location: Winston-Salem, NC and Ocala, FL

Re: 69 roadster master cylinder, replace or rebuild

Post by notoptoy »

Try bleeding the master cylinder on the car - this is an often overlooked step. Once you bleed the master, if you get some pedal back, re-bleed at the cylinders. Also, make sure - really sure, that your back brakes are adjusted correctly. Your handbrake should only pull up for 3 or 4 clicks if adjusted correctly.
"When all else fails, force prevails!" Ummm, we're gonna need a bigger hammer here.

67.5 SPL311 H20 w/5 speed
65 Impala Convertible
2017 C43 AMG

User avatar
theunz
Roadster Nut-Site Supporter
Posts: 1477
Joined: Sat May 02, 2009 1:54 pm
Location: Catoosa Ok.
Model: 2000
Year: High Windshield-68-70

Re: 69 roadster master cylinder, replace or rebuild

Post by theunz »

Unless you’re dead set on originality the 510 master is a very viable option. Just needs a couple of adapters and looks very similar. Well under $100.00, check it out in the tech wiki.
Mike M
1969 2000 solex mine since 1972, under resurrection. (Finally resurrected as of spring 2019!) 1969 Porsche 911s -worth more, but not as valuable! (Soon to be resurrected)

roadsterred
Roadster Nut
Posts: 31
Joined: Sat Mar 26, 2011 10:35 pm
Location: Honolulu, Hawaii

Re: 69 roadster master cylinder, replace or rebuild

Post by roadsterred »

Just installed a new 510 Raybestos Master Cylinder on my 1968 Roadster. The installation was snap except for what followed. After bleeding the brakes, the brake system worked except for a spongy pedal. After doing some homework, it appears that converting from DOT 4 to DOT 5 silicone was the culprit.

However, that's not the end of the story. Unbeknownst to me, the C clip holding in the brake pedal push rod became dislodged and all of the brake fluid from the front brake reservoir leaked out. After removing and inspecting the master cylinder, it was apparent that the groove for the C clip was not deep enough. I used a Dremel with a grinding disc to deepen the grove. The C clip not fits properly and I will be reinstalling the master cylinder.

User avatar
zippy67roadster
Roadster Fanatic-Site Supporter
Posts: 1255
Joined: Tue Dec 08, 2009 4:43 pm
Location: Taylor, Texas
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: 69 roadster master cylinder, replace or rebuild

Post by zippy67roadster »

mdkelsay wrote:
Sat Jul 13, 2019 3:36 pm
Having some brake issues; part of it seems to be due to a potentially faulty master cylinder.

Anyone rebuilt one of these, and if so, hos did it go?

I really don't want to spend $900+ for a new one....

Anyone find a substitute for the stock dual master cylinder?
Have patience as I am working on a reasonable replacement. Please stand by.
1967 Datsun SPL311-08935-vintage race car
1967 Datsun SPL311-10123 project
1967 Datsun 411 wagon
Brian
http://www.sincitydatsuns.com
https://www.facebook.com/sincitydatsuns

Datsuns4Me
Roadster Enthusiast
Posts: 36
Joined: Mon Jan 11, 2016 6:05 pm
Location: somewher between here and there

Re: 69 roadster master cylinder, replace or rebuild

Post by Datsuns4Me »

theunz wrote:
Tue Jan 14, 2020 6:47 pm
Unless you’re dead set on originality the 510 master is a very viable option. Just needs a couple of adapters and looks very similar. Well under $100.00, check it out in the tech wiki.
Where can a 510 master be source please? And what year 510 units work?
sitting somewhere in the sands of time

User avatar
theunz
Roadster Nut-Site Supporter
Posts: 1477
Joined: Sat May 02, 2009 1:54 pm
Location: Catoosa Ok.
Model: 2000
Year: High Windshield-68-70

Re: 69 roadster master cylinder, replace or rebuild

Post by theunz »

Go to the Tech Wiki and look under brakes. It’s the 68 to 72 model. You also need to buy two metric to SAE adapters, it’s also in the tech wiki. I got mine from rock auto.
Mike M
1969 2000 solex mine since 1972, under resurrection. (Finally resurrected as of spring 2019!) 1969 Porsche 911s -worth more, but not as valuable! (Soon to be resurrected)

User avatar
AidanDawn2000
Roadsteraholic
Posts: 1008
Joined: Fri Aug 14, 2015 6:33 pm
Location: Santa Cruz, CA

Re: 69 roadster master cylinder, replace or rebuild

Post by AidanDawn2000 »

I tracked down a few part numbers and eventually found one on amazon for $15 (sadly i think it was the last one in stock there)
Oil a little low? Time to get a longer dipstick:)
Instagram!!!
1968 2000 SRL311-05110 (first car! Rust Bucket. Sold :( )
1969 2000 SRL311-10440 (matching numbers, Solex!)

User avatar
Linda
Roadster Enthusiast
Posts: 7087
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: 69 roadster master cylinder, replace or rebuild

Post by Linda »

Rockauto has Cardone 11-1538 listed, but out of stock.
Linda
68 1600 Los Angeles, CA
New owners must read: the ultimate road trip, by Scott-http://www.roadsterroadtrip.com/index.php/readfromstart