DIY 002a Bendix Poppet-Valve Type Booster
Posted: Tue 29. Sep 2009, 08:15
DIY002a Bendix Poppet-Valve Type Booster ..RevB
RevB-Delete incorrect list of applications.Add correct Applications for this unit.Correct description in text(a58pacer)
Thank you a58pacer for supplying valuable information
Bendix Treadle-Vac
Poppet-Valve Type is the early version of this unit.
The Treadle-Vac manufactured by Bendix was available for various years on many cars of the 1950s (all GM, Edsel, Lincoln, Mercury, Hudson, Nash and even Mercedes). The Treadle-Vac was superseded in 1959 by the familiar Delco-Moraine power booster.
There were several types of power cylinders used. I will cover Poppet-Valve Type in this section.
( Parts are not available for the vacuum booster )
Bendix Treadle-Vac
Poppet-Valve Type
Lincoln 1956-1958 (L-3, L-4, L-5 and L-6)
Continental Mark II 1956-1957 (F)
Mercury 1956 (M and M-3)
First let me illustrate some differences.
These are various booster types. Different diameters. Generally speaking the larger diameter unit (6")is the Poppet-Valve Type Booster. The smaller Diameter (5 1/4") Pictured in the middle, is the newer design Hydraulic- Reaction Type and the Disc- Reaction Type. This smaller unit replaces or supersedes the Poppet-Valve unit. The units are interchangeable but maybe not correct for the specific model that you have. In fact my two 59 Lincolns one has a 56 Mark II Pop type booster while the other has the correct disc -reaction type they both stop just fine.
Notice the heat shield on the far right unit. This was used on the early Lincolns and Mark II 's due to the placement over the exhaust manifold.
There are several types of tops /covers for the master cylinder....some were vented and some were not. This illustration shows several screw-on lids. Plastic and metal.
The castings ....some were vented and some were not. The vented unit was used with the Poppet-valve booster that vents to the back of the casting just in front of the dust seal. The purpose of the vent was to allow brake fluid that leaked past the packing seal to find its way back into the reservoir. This prevented the brake fluid from entering the vacuum booster and having it drawn into engine or auxiliary vacuum canister. By then the packing seal was comprised and you still had to break it down for repair.
Both of these castings are in perfect condition and are usable. The green finish is correct for these units. It protects the casting from degrading. I will use both of these casting for my cars even though the vented unit in not a numbers matching part the counter bore is perfect.
Here is the Poppet-valve booster ...
The piston and packing assembly removed from the cylinder
The piston and packing assembly removed from the cylinder in the foreground and Another unit just behind it.
RevB-Delete incorrect list of applications.Add correct Applications for this unit.Correct description in text(a58pacer)
Thank you a58pacer for supplying valuable information
Bendix Treadle-Vac
Poppet-Valve Type is the early version of this unit.
The Treadle-Vac manufactured by Bendix was available for various years on many cars of the 1950s (all GM, Edsel, Lincoln, Mercury, Hudson, Nash and even Mercedes). The Treadle-Vac was superseded in 1959 by the familiar Delco-Moraine power booster.
There were several types of power cylinders used. I will cover Poppet-Valve Type in this section.
( Parts are not available for the vacuum booster )
Bendix Treadle-Vac
Poppet-Valve Type
Lincoln 1956-1958 (L-3, L-4, L-5 and L-6)
Continental Mark II 1956-1957 (F)
Mercury 1956 (M and M-3)
First let me illustrate some differences.
These are various booster types. Different diameters. Generally speaking the larger diameter unit (6")is the Poppet-Valve Type Booster. The smaller Diameter (5 1/4") Pictured in the middle, is the newer design Hydraulic- Reaction Type and the Disc- Reaction Type. This smaller unit replaces or supersedes the Poppet-Valve unit. The units are interchangeable but maybe not correct for the specific model that you have. In fact my two 59 Lincolns one has a 56 Mark II Pop type booster while the other has the correct disc -reaction type they both stop just fine.
Notice the heat shield on the far right unit. This was used on the early Lincolns and Mark II 's due to the placement over the exhaust manifold.
There are several types of tops /covers for the master cylinder....some were vented and some were not. This illustration shows several screw-on lids. Plastic and metal.
The castings ....some were vented and some were not. The vented unit was used with the Poppet-valve booster that vents to the back of the casting just in front of the dust seal. The purpose of the vent was to allow brake fluid that leaked past the packing seal to find its way back into the reservoir. This prevented the brake fluid from entering the vacuum booster and having it drawn into engine or auxiliary vacuum canister. By then the packing seal was comprised and you still had to break it down for repair.
Both of these castings are in perfect condition and are usable. The green finish is correct for these units. It protects the casting from degrading. I will use both of these casting for my cars even though the vented unit in not a numbers matching part the counter bore is perfect.
Here is the Poppet-valve booster ...
The piston and packing assembly removed from the cylinder
The piston and packing assembly removed from the cylinder in the foreground and Another unit just behind it.