To: Volvo303@yahoogroups.com From: "Will Mayberry" Date: Mon, 14 Apr 2008 23:59:15 -0000 Subject: [Volvo303] Re: Brake Booster: Lockheed Part Number Reply-To: Volvo303@yahoogroups.com --- In Volvo303@yahoogroups.com, David Giller wrote: > On Apr 14, 2008, at 2:37 PM, Will Mayberry wrote: > > Greetings, > > > > I've finally solved my cold weather / missing brake fluid / white > > smoke mystery (with help from Bernard Audet). I opened my rear vacuum > > brake booster and found it filled with about 2 pints of brake fluid, > > which was getting sucked into the vacuum system (hence the nasty white > > smoke). The big rubber diaphragm appears to be intact, so it looks > > like the brake fluid is leaking out of the piston at the top. > > > > I cross-referenced some replacement units, but I'd like to get the > > original Lockheed part number off the piston portion of the booster. > > My are difficult to read. It looks like it 3232-656C. Can anybody > > read theirs? > > > > I'm trying to find a rebuild kit. The replacement vacuum brake > > boosters are going for around $450, and I've got a kid in college, so > > I rebuild or wait. > > > > Thanks, > > > > Will > > Hi Will, > > Where were you able to locate a source for a new/remanufactured > booster? Mine are working but that's one of the parts that worries > me. I don't want to replace a booster, but I'd like to know that I > *can*. > > Thanks, > Dave > Dave, If you look in the database section, I've found several replacements. The following item is currently available on e-bay: Jaguar XJ6 Brake Servo Part # LR18230 (#320145884139) which I've cross referenced, but not bought or installed myself. I think the "Jaguar XJ6" title is incorrect, but the part number is coorect. Our Volvos use the same brake vacuum booster that is used in Rover P6 2200 and Aston Martin DB5. I'm also trying to track down rebuild kits. S/F, Will To: Volvo303@yahoogroups.com From: "David" Date: Mon, 30 Mar 2009 02:01:20 -0000 Subject: [Volvo303] Parts info Reply-To: Volvo303@yahoogroups.com Sold my volvo but was going thru ond files and found the following info that may be of use to someone. CV joint boots were bought new in 2005 from a Volvo truck dealer. Price was $66.67 each Canadian and part number was 1563012-2. Delivery was very fast! Kits to overhaul the frame mounted brake boosters bought from Lucas in 1978. Part number was SP2625 Price was $29.00 each Canadian. Dave p http://www.trog.us/2009/03/19/brakes-againpicture-explains-some-things/ xxxxxxxxxxxxxxxxxxxxx Brakes again…Picture explains some things March 19th, 2009 No comments One of the brake fluid reservoirs keeps emptying, and I’ve been scratching my head trying to figure out where the brake fluid goes. It does soak into the concrete and evaporate, so a slow leak could go unnoticed. However….this pic shows where the mystery fluid went. trog-explains-some-things That’s the upper brake servo. Upon opening it 1 liter of brake fluid came gushing out! Ooops. Alternating brake fluid colors between blue and yellow lets you know when you have completely bled the system when replacing all the brake fluid. trog-brake-servo I suspect moisture in the brake fluid caused the slave cylinder walls to corrode, allowing brake fluid to sneak past the cup seal and into the vacuum chamber on the right. Fluid could have also slipped by the reaction piston as well. Surprisingly the rubber bellows and seals seemed to be in great condition. Here’s a pic of a more modern slave and reaction piston. trog-slave-reaction Slave piston on top, reaction on bottom. The reaction piston in Trog only had 1 O ring seal - a failure point addressed with the double seal in later revisiion….so that could be the culprit. (Pic stolen from the website linked below) Here’s a page on a rebuild of the servos http://www.triumph-spitfire.nl/servoimages.htm I could have possibly had the cylinder sleaved with chromed inserts, but given that the whole unit is 30 years old and it is an essential safety feature, I think replacement is prudent. The new replacements from SNG Barrat USA have a higher boost ratio as well at 4.25:1 vs 3:1 of the old servos (I’m not 100% sure the old ones are 3:1). This means the braking power will be increased. Will the brake saga end here? There is a 30 year old master cylinder that I haven’t dug into yet…. UPDATE (3/11/2010): The old boost ratio is “approx 4x” according to the service manual. A reader pointed out that the vacuum shell, slave and reaction cylinder diameters are the same on the LR18230 as on the stock servo (8", 5/8" and 3/8" respectively). So it makes sense the boost ratio would be the same. xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx